Publications

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PGIR 20eid (SN2020qmp): A Type IIP Supernova at 15.6 Mpc discovered by the Palomar Gattini-IR survey

We present a detailed analysis of SN 2020qmp, a nearby type IIP core-collapse supernova (CCSN), discovered by the Palomar Gattini-IR …

Removing Atmospheric Fringes from Zwicky Transient Facility i-Band Images using Principal Component Analysis

The Zwicky Transient Facility is a time-domain optical survey that has substantially increased our ability to observe and construct …

Beyond Low Earth Orbit: Biomonitoring, Artificial Intelligence, and Precision Space Health

Human space exploration beyond low Earth orbit will involve missions of significant distance and duration. To effectively mitigate …
Ryan T. Scott, Erik L. Antonsen, Lauren M. Sanders, Jaden J. A. Hastings, Seung-min Park, Graham Mackintosh, Robert J. Reynolds, Adrienne L. Hoarfrost, Aenor Sawyer, Casey S. Greene, Benjamin S. Glicksberg, Corey A. Theriot, Daniel C. Berrios, Jack Miller, Joel Babdor, Richard Barker, Sergio E. Baranzini, Afshin Beheshti, Stuart Chalk, Guillermo M. Delgado-Aparicio, Melissa Haendel, Arif A. Hamid, Philip Heller, Daniel Jamieson, Katelyn J. Jarvis, John Kalantari, Kia Khezeli, Svetlana V. Komarova, Matthieu Komorowski, Prachi Kothiyal, Ashish Mahabal, Uri Manor, Hector Garcia Martin, Christopher E. Mason, Mona Matar, George I. Mias, Charlotte Nelson, Jonathan Oribello, Patricia Parsons-Wingerter, R. K. Prabhu, Amina Ann Qutub, Jon Rask, Amanda Saravia-Butler, Suchi Saria, Nitin Kumar Singh, Frank Soboczenski, Michael Snyder, Karthik Soman, David Van Valen, Kasthuri Venkateswaran, Liz Warren, Liz Worthey, Jason H. Yang, Marinka Zitnik, Sylvain V. Costes

Beyond Low Earth Orbit: Biological Research, Artificial Intelligence, and Self-Driving Labs

Space biology research aims to understand fundamental effects of spaceflight on organisms, develop foundational knowledge to support …
Lauren M. Sanders, Jason H. Yang, Ryan T. Scott, Amina Ann Qutub, Hector Garcia Martin, Daniel C. Berrios, Jaden J. A. Hastings, Jon Rask, Graham Mackintosh, Adrienne L. Hoarfrost, Stuart Chalk, John Kalantari, Kia Khezeli, Erik L. Antonsen, Joel Babdor, Richard Barker, Sergio E. Baranzini, Afshin Beheshti, Guillermo M. Delgado-Aparicio, Benjamin S. Glicksberg, Casey S. Greene, Melissa Haendel, Arif A. Hamid, Philip Heller, Daniel Jamieson, Katelyn J. Jarvis, Svetlana V. Komarova, Matthieu Komorowski, Prachi Kothiyal, Ashish Mahabal, Uri Manor, Christopher E. Mason, Mona Matar, George I. Mias, Jack Miller, Charlotte Nelson, Jonathan Oribello, Seung-min Park, Patricia Parsons-Wingerter, R. K. Prabhu, Robert J. Reynolds, Amanda Saravia-Butler, Suchi Saria, Aenor Sawyer, Nitin Kumar Singh, Frank Soboczenski, Michael Snyder, Karthik Soman, Corey A. Theriot, David Van Valen, Kasthuri Venkateswaran, Liz Warren, Liz Worthey, Marinka Zitnik, Sylvain V. Costes

The large-scale environment of thermonuclear and core-collapse supernovae

The new generation of wide-field time-domain surveys has made it feasible to study the clustering of supernova (SN) host galaxies in …

Characterizing Sparse Asteroid Light Curves with Gaussian Processes

In the era of wide-field surveys like the Zwicky Transient Facility and the Rubin Observatory’s Legacy Survey of Space and Time, …

GWSkyNet-Multi: A Machine Learning Multi-Class Classifier for LIGO-Virgo Public Alerts

Compact object mergers which produce both detectable gravitational waves and electromagnetic emission can provide valuable insights …

Two c's in a pod: Cosmology independent measurement of the Type Ia supernova colour-luminosity relation with a sibling pair

Using Zwicky Transient Facility (ZTF) observations, we identify a pair of arcsecsibling arcsec Type Ia supernovae (SNe Ia), i.e., …

Faintest of them all : ZTF 21aaoryiz/SN 2021fcg -- Discovery of an extremely low luminosity type Iax supernova

We present the discovery of ZTF 21aaoryiz/SN 2021fcg – an extremely low-luminosity Type Iax supernova. SN 2021fcg was discovered …

Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars

We present XMM-Newton X-ray observations of nine confirmed lensed quasars at $1 lesssim z lesssim 3$ identified by the Gaia …

AT2018lqh and the nature of the emerging population of day-scale duration optical transients

We report on the discovery of AT2018lqh (ZTF18abfzgpl) – a rapidly-evolving extra-galactic transient in a star-forming host at …

A tidal disruption event coincident with a high-energy neutrino

Cosmic neutrinos provide a unique window into the otherwise-hidden mechanism of particle acceleration in astrophysical objects. A flux …
Robert Stein, Sjoert van Velzen, Marek Kowalski, Anna Franckowiak, Suvi Gezari, James C. A. Miller-Jones, Sara Frederick, Itai Sfaradi, Michael F. Bietenholz, Assaf Horesh, Rob Fender, Simone Garrappa, Tomás Ahumada, Igor Andreoni, Justin Belicki, Eric C. Bellm, Markus Böttcher, Valery Brinnel, Rick Burruss, S. Bradley Cenko, Michael W. Coughlin, Virginia Cunningham, Andrew Drake, Glennys R. Farrar, Michael Feeney, Ryan J. Foley, Avishay Gal-Yam, V. Zach Golkhou, Ariel Goobar, Matthew J. Graham, Erica Hammerstein, George Helou, Tiara Hung, Mansi M. Kasliwal, Charles D. Kilpatrick, Albert K. H. Kong, Thomas Kupfer, Russ R. Laher, Ashish A. Mahabal, Frank J. Masci, Jannis Necker, Jakob Nordin, Daniel A. Perley, Mickael Rigault, Simeon Reusch, Hector Rodriguez, César Rojas-Bravo, Ben Rusholme, David L. Shupe, Leo P. Singer, Jesper Sollerman, Maayane T. Soumagnac, Daniel Stern, Kirsty Taggart, Jakob van Santen, Charlotte Ward, Patrick Woudt, Yuhan Yao

A method for finding anomalous astronomical light curves and their analogs

Our understanding of the Universe has profited from deliberate, targeted studies of known phenomena, as well as from serendipitous, …

Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: a pioneering process of community-focused experimental design

Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science …

The Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC): Selection of a performance metric for classification probabilities balancing diverse science goals

Classification of transient and variable light curves is an essential step in using astronomical observations to develop an …

Deep Co-Added Sky from Catalina Sky Survey Images

A number of synoptic sky surveys are underway or being planned. Typically they are done with small telescopes and relatively short …

A highly magnetised and rapidly rotating white dwarf as small as the Moon

White dwarfs represent the last stage of evolution of stars with mass less than about eight times that of the Sun and, like other …

Cataclysmic Variables in the Second Year of the Zwicky Transient Facility

Using a filter in the GROWTH Marshal based on color and the amplitude and the timescale of variability, we have identified 372 objects …

The Time-Dependent Distribution of Optical Polarization Angle Changes in Blazars

At optical wavelengths, blazar Electric Vector Position Angle (EVPA) rotations linked with gamma-ray activity have been the subject of …

The Deeper, Wider, Faster Program: Exploring stellar flare activity with deep, fast cadenced DECam imaging via machine learning

We present our 500 pc distance-limited study of stellar fares using the Dark Energy Camera as part of the Deeper, Wider, Faster …

Alert Classification for the ALeRCE Broker System: The Real-time Stamp Classifier

We present a real-time stamp classifier of astronomical events for the ALeRCE (Automatic Learning for the Rapid Classification of …

Gaia Photometric Science Alerts

Since July 2014, the Gaia mission has been engaged in a high-spatial-resolution, time-resolved, precise, accurate astrometric, and …
S. T. Hodgkin, D. L. Harrison, E. Breedt, T. Wevers, G. Rixon, A. Delgado, A. Yoldas, Z. Kostrzewa-Rutkowska, Ł. Wyrzykowski, M. van Leeuwen, N. Blagorodnova, H. Campbell, D. Eappachen, M. Fraser, N. Ihanec, S. E. Koposov, K. Kruszyńska, G. Marton, K. A. Rybicki, A. G. A. Brown, P. W. Burgess, G. Busso, S. Cowell, F. De Angeli, C. Diener, D. W. Evans, G. Gilmore, G. Holland, P. G. Jonker, F. van Leeuwen, F. Mignard, P. J. Osborne, J. Portell, T. Prusti, P. J. Richards, M. Riello, G. M. Seabroke, N. A. Walton, Péter Ábrahám, G. Altavilla, S. G. Baker, U. Bastian, P. O'Brien, J. de Bruijne, T. Butterley, J. M. Carrasco, J. Castañeda, J. S. Clark, G. Clementini, C. M. Copperwheat, M. Cropper, G. Damljanovic, M. Davidson, C. J. Davis, M. Dennefeld, V. S. Dhillon, C. Dolding, M. Dominik, P. Esquej, L. Eyer, C. Fabricius, M. Fridman, D. Froebrich, N. Garralda, A. Gomboc, J. J. González-Vidal, R. Guerra, N. C. Hambly, L. K. Hardy, B. Holl, A. Hourihane, J. Japelj, D. A. Kann, C. Kiss, C. Knigge, U. Kolb, S. Komossa, Á. Kóspál, G. Kovács, M. Kun, G. Leto, F. Lewis, S. P. Littlefair, A. A. Mahabal, C. G. Mundell, Z. Nagy, D. Padeletti, L. Palaversa, A. Pigulski, M. L. Pretorius, W. van Reeven, V. A. R. M. Ribeiro, M. Roelens, N. Rowell, N. Schartel, A. Scholz, A. Schwope, B. M. Sipőcz, S. J. Smartt, M. D. Smith, I. Serraller, D. Steeghs, M. Sullivan, L. Szabados, E. Szegedi-Elek, P. Tisserand, L. Tomasella, S. van Velzen, P. A Whitelock, R. W. Wilson, D. R. Young

The Photometric and Spectroscopic Evolution of Rapidly Evolving Extragalactic Transients in ZTF

We present 42 rapidly evolving (time spent above half-maximum brightness $t_{1⁄2}<12$d) extragalactic transients from Phase I …

ZTFJ0038+2030: a long period eclipsing white dwarf and a substellar companion

In a search for eclipsing white dwarfs using the Zwicky Transient Facility lightcurves, we identified a deep eclipsing white dwarf with …

Zwicky Transient Facility and Globular Clusters: the Period-Luminosity and Period-Luminosity-Color Relations for Late-Type Contact Binaries

In this work, we aimed to derive the $gri$-band period-luminosity (PL) and period-luminosity-color (PLC) relations for late-type …

Discovery and confirmation of the shortest gamma ray burst from a collapsar

Gamma-ray bursts (GRBs) are among the brightest and most energetic events in the universe. The duration and hardness distribution of …
Tomás Ahumada, Leo P. Singer, Shreya Anand, Michael W. Coughlin, Mansi M. Kasliwal, Geoffrey Ryan, Igor Andreoni, S. Bradley Cenko, Christoffer Fremling, Harsh Kumar, Peter T. H. Pang, Eric Burns, Virginia Cunningham, Simone Dichiara, Tim Dietrich, Dmitry S. Svinkin, Mouza AlMualla, Alberto J. Castro-Tirado, Kishalay De, Rachel Dunwoody, Pradip Gatkine, Erica Hammerstein, Shabnam Iyyani, Joseph Mangan, Dan Perley, Sonalika Purkayastha, Eric Bellm, Varun Bhalerao, Bryce Bolin, Mattia Bulla, Christopher Cannella, Poonam Chandra, Dmitry A. Duev, Dmitry Frederiks, Avishay Gal-Yam, Matthew Graham, Anna Y. Q. Ho, Kevin Hurley, Viraj Karambelkar, Erik C. Kool, S. R. Kulkarni, Ashish Mahabal, Frank Masci, Sheila McBreen, Shashi B. Pandey, Simeon Reusch, Anna Ridnaia, Philippe Rosnet, Benjamin Rusholme, Ana Sagues Carracedo, Roger Smith, Maayane Soumagnac, Robert Stein, Eleonora Troja, Anastasia Tsvetkova, Richard Walters, Azamat F. Valeev

A systematic search for outbursting AM CVn systems with the Zwicky Transient Facility

AM CVn systems are a rare type of accreting binary that consists of a white dwarf and a helium-rich, degenerate donor star. Using the …

Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically-discovered Gamma-ray Burst Afterglows and New Constraints on the Kilonova Rate

While optical surveys regularly discover slow transients like supernovae on their own, the most common way to discover extragalactic …

AGN on the move: A search for off-nuclear AGN from recoiling SMBHs and ongoing galaxy mergers with the Zwicky Transient Facility

A supermassive black hole (SMBH) ejected from the potential well of its host galaxy via gravitational wave recoil carries important …

Time-series and Phasecurve Photometry of Episodically-Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200 and ZTF

We observed Episodically Active Asteroid (6478) Gault in 2020 with multiple telescopes in Asia and North America and have found that it …
Josiah N. Purdum, Zhong-Yi Lin, Bryce T. Bolin, Kritti Sharma, Philip I. Choi, Varun Bhalerao, Harsh Kumar, Robert Quimby, Joannes C. Van Roestel, Chengxing Zhai, Yanga R. Fernandez, Josef Hanuš, Carey M. Lisse, Dennis Bodewits, Christoffer Fremling, Nathan Ryan Golovich, Chen-Yen Hsu, Wing-Huen Ip, Chow-Choong Ngeow, Navtej S. Saini, Michael Shao, Yuhan Yao, Tomás Ahumada, Shreya Anand, Igor Andreoni, Kevin B. Burdge, Rick Burruss, Chan-Kao Chang, Chris M. Copperwheat, Michael Coughlin, Kishalay De, Richard Dekany, Alexandre Delacroix, Andrew Drake, Dmitry Duev, Matthew Graham, David Hale, Erik C. Kool, Mansi M. Kasliwal, Iva S. Kostadinova, Shrinivas R. Kulkarni, Russ R. Laher, Ashish Mahabal, Frank J. Masci, Przemyslaw J. Mróz, James D. Neill, Reed Riddle, Hector Rodriguez, Roger M. Smith, Richard Walters, Lin Yan, Jeffry Zolkower

Tails: Chasing Comets with the Zwicky Transient Facility and Deep Learning

We present Tails, an open-source deep-learning framework for the identification and localization of comets in the image data of the …

The ZTF Source Classification Project: I. Methods and Infrastructure

The Zwicky Transient Facility (ZTF) has been observing the entire northern sky since the start of 2018 down to a magnitude of 20.5 ($5 …

Nigraha: Machine-learning based pipeline to identify and evaluate planet candidates from TESS

The Transiting Exoplanet Survey Satellite (TESS) has now been operational for a little over two years, covering the Northern and the …

A population of heavily reddened, optically missed novae from Palomar Gattini-IR: Constraints on the Galactic nova rate

The nova rate in the Milky Way remains largely uncertain, despite its vital importance in constraining models of Galactic chemical …

Nigraha: Machine-learning based pipeline to identify and evaluate planet candidates from TESS

The Transiting Exoplanet Survey Satellite (TESS) has now been operational for a little over two years, covering the Northern and the …

GWSkyNet: a real-time classifier for public gravitational-wave candidates

The rapid release of accurate sky localization for gravitational-wave candidates is crucial for multi-messenger observations. During …

Initial Characterization of Active Transitioning Centaur, P/2019 LD2 (ATLAS), using Hubble, Spitzer, ZTF, Keck, APO and GROWTH Visible & Infrared Imaging and Spectroscopy

We present visible and mid-infrared imagery and photometry of temporary Jovian co-orbital comet P/2019 LD$_2$ taken with HST/WFC3, …

Results of the Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC)

Next-generation surveys like the Legacy Survey of Space and Time (LSST) on the Vera C. Rubin Observatory will generate orders of …

Gaia GraL: Gaia DR2 Gravitational Lens Systems. VI. Spectroscopic Confirmation and Modeling of Quadruply-Imaged Lensed Quasars

Combining the exquisite angular resolution of Gaia with optical light curves and WISE photometry, the Gaia Gravitational Lenses group …

AGN on the move: A search for off-nuclear AGN from recoiling SMBHs and ongoing galaxy mergers with the Zwicky Transient Facility

A supermassive black hole (SMBH) ejected from the potential well of its host galaxy via gravitational wave recoil carries important …

GWSkyNet: a real-time classifier for public gravitational-wave candidates

The rapid release of accurate sky localization for gravitational-wave candidates is crucial for multi-messenger observations. During …

TDE Hosts are Green and Centrally Concentrated: Signatures of a Post-Merger System

We study the properties of the galaxies hosting the first 19 tidal disruption events (TDEs) detected with the Zwicky Transient Facility …

A Family Tree of Optical Transients from Narrow-Line Seyfert 1 Galaxies

The Zwicky Transient Facility (ZTF) has discovered five new events belonging to an emerging class of AGN undergoing smooth flares with …

An 8.8 minute orbital period eclipsing detached double white dwarf binary

We report the discovery of ZTF J2243+5242, an eclipsing double white dwarf binary with an orbital period of just $8.8$ minutes, the …

The Zwicky Transient Facility Bright Transient Survey. II. A Public Statistical Sample for Exploring Supernova Demographics

We present a public catalog of transients from the Zwicky Transient Facility (ZTF) Bright Transient Survey (BTS), a magnitude-limited …

Spatiotemporal strategies to identify aggressive biology in precancerous breast biopsies

Over 90% of breast cancer is cured; yet there remain highly aggressive breast cancers that develop rapidly and are extremely difficult …

The ZTF Source Classification Project: II. Periodicity and variability processing metrics

The current generation of all-sky surveys is rapidly expanding our ability to study variable and transient sources. These surveys, with …

Cancer Biomarkers and Big Data: A Planetary Science Approach

Cancer biomarker research has become a data-intensive discipline requiring innovative approaches for data analysis that can combine …

ZTF Early Observations of Type Ia Supernovae II: First Light, the Initial Rise, and Time to Reach Maximum Brightness

While it is clear that Type Ia supernovae (SNe) are the result of thermonuclear explosions in C/O white dwarfs (WDs), a great deal …

Supernova SN 2020faa -- an iPTF14hls look-alike?

We present observations of SN 2020faa. This Type II supernova displays a luminous light curve that started to rebrighten from an …

Where is Waldo (and his friends)? A comparison of anomaly detection algorithms for time-domain astronomy

Our understanding of the Universe has progressed through deliberate, targeted studies of known phenomena, like the supernova campaigns …

A kilometer-scale asteroid inside Venus's orbit

Near-Earth asteroid population models predict the existence of asteroids located inside the orbit of Venus. However, despite searches …

A systematic search of Zwicky Transient Facility data for ultracompact binary LISA-detectable gravitational-wave sources

Using photometry collected with the Zwicky Transient Facility (ZTF), we are conducting an ongoing survey for binary systems with short …

A large fraction of hydrogen-rich supernova progenitors experience elevated mass loss shortly prior to explosion

Spectroscopic detection of narrow emission lines traces the presence of circumstellar mass distributions around massive stars exploding …

Characterization of Temporarily-Captured Minimoon 2020 CD$_3$ by Keck Time-resolved Spectrophotometry

We present time-resolved visible spectrophotometry of minimoon 2020 CD$_3$, the second asteroid known to become temporarily captured by …

Unsupervised machine learning for transient discovery in Deeper, Wider, Faster light curves

Identification of anomalous light curves within time-domain surveys is often challenging. In addition, with the growing number of …

Alert Classification for the ALeRCE Broker System: The Real-time Stamp Classifier

We present a real-time stamp classifier of astronomical events for the ALeRCE (Automatic Learning for the Rapid Classification of …

The Automatic Learning for the Rapid Classification of Events (ALeRCE) Alert Broker

We introduce the Automatic Learning for the Rapid Classification of Events (ALeRCE) broker, an astronomical alert broker designed to …

New methods to assess and improve LIGO detector duty cycle

A network of three or more gravitational wave detectors simultaneously taking data is required to generate a well-localized sky map for …

Constraining the Kilonova Rate with Zwicky Transient Facility Searches Independent of Gravitational Wave and Short Gamma-ray Burst Triggers

The first binary neutron star merger, GW170817, was accompanied by a radioactivity-powered optical/infrared transient called a …

A new class of Roche lobe-filling hot subdwarf binaries

We present the discovery of the second binary with a Roche lobe-filling hot subdwarf transferring mass to a white dwarf (WD) companion. …

The Spectacular Ultraviolet Flash From the Peculiar Type Ia Supernova 2019yvq

Early observations of Type Ia supernovae (SNe$,$Ia) provide essential clues for understanding the progenitor system that gave rise to …

Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational Wave Event S190521g

We report the first plausible optical electromagnetic (EM) counterpart to a (candidate) binary black hole (BBH) merger. Detected by the …

Kilonova Luminosity Function Constraints based on Zwicky Transient Facility Searches for 13 Neutron Star Mergers

We present a systematic search for optical counterparts to 13 gravitational wave (GW) triggers involving at least one neutron star …
Mansi M. Kasliwal, Shreya Anand, Tomás Ahumada, Robert Stein, Ana Sagues Carracedo, Igor Andreoni, Michael W. Coughlin, Leo P. Singer, Erik C. Kool, Kishalay De, Harsh Kumar, Mouza AlMualla, Yuhan Yao, Mattia Bulla, Dougal Dobie, Simeon Reusch, Daniel A. Perley, S. Bradley Cenko, Varun Bhalerao, David L. Kaplan, Jesper Sollerman, Ariel Goobar, Christopher M. Copperwheat, Eric C. Bellm, G. C. Anupama, Alessandra Corsi, Samaya Nissanke, Ivan Agudo, Ashot Bagdasaryan, Sudhanshu Barway, Justin Belicki, Joshua S. Bloom, Bryce Bolin, David A. H. Buckley, Kevin B. Burdge, Rick Burruss, Maria D. Caballero-Garcıa, Chris Cannella, Alberto J. Castro-Tirado, David O. Cook, Jeff Cooke, Virginia Cunningham, Aishwarya Dahiwale, Kunal Deshmukh, Simone Dichiara, Dmitry A. Duev, Anirban Dutta, Michael Feeney, Anna Franckowiak, Sara Frederick, Christoffer Fremling, Avishay Gal-Yam, Pradip Gatkine, Shaon Ghosh, Daniel A. Goldstein, V. Zach Golkhou, Matthew J. Graham, Melissa L. Graham, Matthew J. Hankins, George Helou, Youdong Hu, Wing-Huen Ip, Amruta Jaodand, Viraj Karambelkar, Albert K. H. Kong, Marek Kowalski, Maitreya Khandagale, S. R. Kulkarni, Brajesh Kumar, Russ R. Laher, K. L. Li, Ashish Mahabal, Frank J. Masci, Adam A. Miller, Moses Mogotsi, Siddharth Mohite, Kunal Mooley, Przemek Mroz, Jeffrey A. Newman, Chow-Choong Ngeow, Samantha R. Oates, Atharva Sunil Patil, Shashi B. Pandey, M. Pavana, Elena Pian, Reed Riddle, Ruben Sanchez-Ramırez, Yashvi Sharma, Avinash Singh, Roger Smith, Maayane T. Soumagnac, Kirsty Taggart, Hanjie Tan, Anastasios Tzanidakis, Eleonora Troja, Azamat F. Valeev, Richard Walters, Gaurav Waratkar, Sara Webb, Po-Chieh Yu, Bin-Bin Zhang, Rongpu Zhou, Jeffry Zolkower

Zwicky Transient Facility constraints on the optical emission from the nearby repeating FRB 180916.J0158+65

The discovery rate of fast radio bursts (FRBs) is increasing dramatically thanks to new radio facilities. Meanwhile, wide-field …

Recurring Outbursts of P/2019 LM$_4$ (Palomar)

We present a preliminary analysis of comet P/2019 LM$_4$ (Palomar) as observed by the Zwicky Transient Facility (ZTF) survey in 2019 …

A Search for Extra-Tidal RR Lyrae in the Globular Cluster NGC 5024 and NGC 5053

Recently, Kundu et al (2019) reported that the globular cluster NGC 5024 (M53) possesses five extra-tidal RR Lyrae. In fact, four of …

Characterization of the Nucleus, Morphology and Activity of Interstellar Comet 2I/Borisov by Optical and Near-Infrared GROWTH, Apache Point, IRTF, ZTF and Keck Observations

We present visible and near-infrared photometric and spectroscopic observations of interstellar object 2I/Borisov taken from 2019 …
Bryce T. Bolin, Carey M. Lisse, Mansi M. Kasliwal, Robert Quimby, Hanjie Tan, Chris Copperwheat, Zhong-Yi Lin, Alessandro Morbidelli, Lyu Abe, Philippe Bendjoya, James Bauer, Kevin B. Burdge, Michael Coughlin, Christoffer Fremling, Ryosuke Itoh, Michael Koss, Frank J. Masci, Syota Maeno, Eric E. Mamajek, Federico Marocco, Katsuhiro Murata, Jean-Pierre Rivet, Michael L. Sitko, Daniel Stern, David Vernet, Richard Walters, Lin Yan, Igor Andreoni, Varun Bhalerao, Dennis Bodewits, Kishalay De, Kunal P. Deshmukh, Eric C. Bellm, Nadejda Blagorodnova, Derek Buzasi, S. Bradley Cenko, Chan-Kao Chang, Drew Chojnowski, Richard Dekany, Dmitry A. Duev, Matthew Graham, Mario Jurić, Emily A. Kramer, Shrinivas R. Kulkarni, Thomas Kupfer, Ashish Mahabal, James D. Neill, Chow-Choong Ngeow, Bryan Penprase, Reed Riddle, Hector Rodriguez, Philippe Rosnet, Roger M. Smith, Jesper Sollerman, Maayane T. Soumagnac

A high-energy neutrino coincident with a tidal disruption event

Cosmic neutrinos provide a unique window into the otherwise-hidden mechanism of particle acceleration in astrophysical objects. A flux …
Robert Stein, Sjoert van Velzen, Marek Kowalski, Anna Franckowiak, Suvi Gezari, James C. A. Miller-Jones, Sara Frederick, Itai Sfaradi, Michael F. Bietenholz, Assaf Horesh, Rob Fender, Simone Garrappa, Tomás Ahumada, Igor Andreoni, Justin Belicki, Eric C. Bellm, Markus Böttcher, Valery Brinnel, Rick Burruss, S. Bradley Cenko, Michael W. Coughlin, Virginia Cunningham, Andrew Drake, Glennys R. Farrar, Michael Feeney, Ryan J. Foley, Avishay Gal-Yam, V. Zach Golkhou, Ariel Goobar, Matthew J. Graham, Erica Hammerstein, George Helou, Tiara Hung, Mansi M. Kasliwal, Charles D. Kilpatrick, Albert K. H. Kong, Thomas Kupfer, Russ R. Laher, Ashish A. Mahabal, Frank J. Masci, Jannis Necker, Jakob Nordin, Daniel A. Perley, Mickael Rigault, Simeon Reusch, Hector Rodriguez, César Rojas-Bravo, Ben Rusholme, David L. Shupe, Leo P. Singer, Jesper Sollerman, Maayane T. Soumagnac, Daniel Stern, Kirsty Taggart, Jakob van Santen, Charlotte Ward, Patrick Woudt, Yuhan Yao

The Broad-lined Ic Supernova ZTF18aaqjovh (SN 2018bvw): An Optically-discovered Engine-driven Supernova Candidate with Luminous Radio Emission

We present ZTF18aaqjovh (SN 2018bvw), a high-velocity ( arcsecbroad-lined arcsec) stripped-envelope (Type Ic) supernova (Ic-BL SN) …

Deep modeling of quasar variability

Quasars have long been known as intrinsically variable sources, but the physical mechanism underlying the temporal optical/UV …

ZTF Early Observations of Type Ia Supernovae II: First Light, the Initial Rise, and Time to Reach Maximum Brightness

While it is clear that Type Ia supernovae (SNe) are the result of thermonuclear explosions in C/O white dwarfs (WDs), a great deal …

Seventeen Tidal Disruption Events from the First Half of ZTF Survey Observations: Entering a New Era of Population Studies

While tidal disruption events (TDEs) have long been heralded as laboratories for the study of quiescent black holes, the small number …

A Twilight Search for Atiras, Vatiras and Co-orbital Asteroids: Preliminary Results

Near-Earth Objects (NEOs) that orbit the Sun on or within Earth’s orbit are tricky to detect for Earth-based observers due to …

Enabling real-time multi-messenger astrophysics discoveries with deep learning

Multi-messenger astrophysics is a fast-growing, interdisciplinary field that combines data, which vary in volume and speed of data …
E. A. Huerta, Gabrielle Allen, Igor Andreoni, Javier M. Antelis, Etienne Bachelet, Bruce Berriman, Federica Bianco, Rahul Biswas, Matias Carrasco, Kyle Chard, Minsik Cho, Philip S. Cowperthwaite, Zachariah B. Etienne, Maya Fishbach, Francisco Förster, Daniel George, Tom Gibbs, Matthew Graham, William Gropp, Robert Gruendl, Anushri Gupta, Roland Haas, Sarah Habib, Elise Jennings, Margaret W. G. Johnson, Erik Katsavounidis, Daniel S. Katz, Asad Khan, Volodymyr Kindratenko, William T. C. Kramer, Xin Liu, Ashish Mahabal, Zsuzsa Marka, Kenton McHenry, Jonah Miller, Claudia Moreno, Mark Neubauer, Steve Oberlin, Alexander R. Olivas, Donald Petravick, Adam Rebei, Shawn Rosofsky, Milton Ruiz, Aaron Saxton, Bernard F. Schutz, Alex Schwing, Ed Seidel, Stuart L. Shapiro, Hongyu Shen, Yue Shen, Leo Singer, Brigitta M. Sipőcz, Lunan Sun, John Towns, Antonios Tsokaros, Wei Wei, Jack Wells, Timothy J. Williams, Jinjun Xiong, Zhizhen Zhao

Eliminating artefacts in Polarimetric Images using Deep Learning

Polarization measurements done using Imaging Polarimeters such as the Robotic Polarimeter are very sensitive to the presence of …

Characterization of the Nucleus, Morphology and Activity of Interstellar Comet 2I/Borisov by Optical and Near-Infrared GROWTH, Apache Point, IRTF, ZTF and Keck Observations

We present visible and near-infrared photometric and spectroscopic observations of interstellar comet 2I/Borisov taken from 2019 …
Bryce T. Bolin, Carey M. Lisse, Mansi M. Kasliwal, Robert Quimby, Hanjie Tan, Chris Copperwheat, Zhong-Yi Lin, Alessandro Morbidelli, James Bauer, Kevin B. Burdge, Michael Coughlin, Christoffer Fremling, Ryosuke Itoh, Michael Koss, Frank J. Masci, Syota Maeno, Eric E. Mamajek, Federico Marocco, Katsuhiro Murata, Michael L. Sitko, Daniel Stern, Richard Walters, Lin Yan, Igor Andreoni, Varun Bhalerao, Dennis Bodewits, Kishalay De, Kunal P. Deshmukh, Eric C. Bellm, Nadejda Blagorodnova, Derek Buzasi, S. Bradley Cenko, Chan-Kao Chang, Drew Chojnowski, Richard Dekany, Dmitry A. Duev, Matthew Graham, Mario Jurić, Emily A. Kramer, Shrinivas R. Kulkarni, Thomas Kupfer, Ashish Mahabal, James D. Neill, Chow-Choong Ngeow, Bryan Penprase, Reed Riddle, Hector Rodriguez, Philippe Rosnet, Jesper Sollerman, Maayane T. Soumagnac

Palomar Gattini-IR: Survey overview, data processing system, on-sky performance and first results

(Abridged) Palomar Gattini-IR is a new wide-field, near-infrared robotic time domain survey operating at Palomar Observatory. Using a …

The Zwicky Transient Facility Bright Transient Survey I: Spectroscopic Classification and the Redshift Completeness of Local Galaxy Catalogs

The Zwicky Transient Facility (ZTF) is performing a three-day cadence survey of the visible Northern sky (~3$pi$). The transient …

New methods to assess and improve LIGO detector duty cycle

A network of three or more gravitational wave detectors simultaneously taking data is required to generate a well-localized sky map for …

DeepStreaks: identifying fast-moving objects in the Zwicky Transient Facility data with deep learning

We present DeepStreaks, a convolutional-neural-network, deep-learning system designed to efficiently identify streaking fast-moving …

Realizing the potential of astrostatistics and astroinformatics

This Astro2020 State of the Profession Consideration White Paper highlights the growth of astrostatistics and astroinformatics in …

General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system

General relativity predicts that short orbital period binaries emit significant gravitational radiation, and the upcoming Laser …

Real-bogus classification for the Zwicky Transient Facility using deep learning

Efficient automated detection of flux-transient, reoccurring flux-variable, and moving objects is increasingly important for …

GROWTH on S190510g: DECam Observation Planning and Follow-Up of a Distant Binary Neutron Star Merger Candidate

The first two months of the third Advanced LIGO and Virgo observing run (2019 April-May) showed that distant gravitational wave (GW) …

Transient processing and analysis using $ exttt{AMPEL}$: Alert Management, Photometry and Evaluation of Lightcurves

Both multi-messenger astronomy and new high-throughput wide-field surveys require flexible tools for the selection and analysis of …

Understanding extreme quasar optical variability with CRTS: II. Changing-state quasars

We present the results of a systematic search for quasars in the Catalina Real-time Transient Survey exhibiting both strong photometric …

Towards Efficient Detection of Small Near-Earth Asteroids Using the Zwicky Transient Facility (ZTF)

We describe ZStreak, a semi-real-time pipeline specialized in detecting small, fast-moving near-Earth asteroids (NEAs) that is …

Astro2020 Science White Paper: The Next Decade of Astroinformatics and Astrostatistics

Over the past century, major advances in astronomy and astrophysics have been largely driven by improvements in instrumentation and …

RoboPol: A four-channel optical imaging polarimeter

We present the design and performance of RoboPol, a four-channel optical polarimeter operating at the Skinakas Observatory in Crete, …

The first tidal disruption flare in ZTF: from photometric selection to multi-wavelength characterization

We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and …

The Zwicky Transient Facility: Science Objectives

The Zwicky Transient Facility (ZTF), a public-private enterprise, is a new time domain survey employing a dedicated camera on the …
Matthew J. Graham, S. R. Kulkarni, Eric C. Bellm, Scott M. Adams, Cristina Barbarino, Nadejda Blagorodnova, Dennis Bodewits, Bryce Bolin, Patrick R. Brady, S. Bradley Cenko, Chan-Kao Chang, Michael W. Coughlin, Kishalay De, Gwendolyn Eadie, Tony L. Farnham, Ulrich Feindt, Anna Franckowiak, Christoffer Fremling, Avishay Gal-Yam, Suvi Gezari, Shaon Ghosh, Daniel A. Goldstein, V. Zach Golkhou, Ariel Goobar, Anna Y. Q. Ho, Daniela Huppenkothen, Željko Ivezić, R. Lynne Jones, Mario Jurić, David L. Kaplan, Mansi M. Kasliwal, Michael S. P. Kelley, Thomas Kupfer, Chien-De Lee, Hsing-Wen Lin, Ragnhild Lunnan, Ashish A. Mahabal, Adam A. Miller, Chow-Choong Ngeow, Peter Nugent, Eran O. Ofek, Thomas A. Prince, Ludwig Rauch, Jan van Roestel, Steve Schulze, Leo P. Singer, Jesper Sollerman, Francesco Taddia, Lin Yan, Quan-Zhi Ye, Po-Chieh Yu, Igor Andreoni, Tom Barlow, James Bauer, Ron Beck, Justin Belicki, Rahul Biswas, Valery Brinnel, Tim Brooke, Brian Bue, Mattia Bulla, Kevin Burdge, Rick Burruss, Andrew Connolly, John Cromer, Virginia Cunningham, Richard Dekany, Alex Delacroix, Vandana Desai, Dmitry A. Duev, Eugean Hacopians, David Hale, George Helou, John Henning, David Hover, Lynne A. Hillenbrand, Justin Howell, Tiara Hung, David Imel, Wing-Huen Ip, Edward Jackson, Shai Kaspi, Stephen Kaye, Marek Kowalski, Emily Kramer, Michael Kuhn, Walter Landry, Russ R. Laher, Peter Mao, Frank J. Masci, Serge Monkewitz, Patrick Murphy, Jakob Nordin, Maria T. Patterson, Bryan Penprase, Michael Porter, Umaa Rebbapragada, Dan Reiley, Reed Riddle, Mickael Rigault, Hector Rodriguez, Ben Rusholme, Jakob van Santen, David L. Shupe, Roger M. Smith, Maayane T. Soumagnac, Robert Stein, Jason Surace, Paula Szkody, Scott Terek, Angela Van Sistine, Sjoert van Velzen, W. Thomas Vestrand, Richard Walters, Charlotte Ward, Chaoran Zhang, Jeffry Zolkower

Machine Learning for the Zwicky Transient Facility

The Zwicky Transient Facility is a large optical survey in multiple filters producing hundreds of thousands of transient alerts per …

The Zwicky Transient Facility: System Overview, Performance, and First Results

The Zwicky Transient Facility (ZTF) is a new optical time-domain survey that uses the Palomar 48-inch Schmidt telescope. A custom-built …
Eric C. Bellm, Shrinivas R. Kulkarni, Matthew J. Graham, Richard Dekany, Roger M. Smith, Reed Riddle, Frank J. Masci, George Helou, Thomas A. Prince, Scott M. Adams, C. Barbarino, Tom Barlow, James Bauer, Ron Beck, Justin Belicki, Rahul Biswas, Nadejda Blagorodnova, Dennis Bodewits, Bryce Bolin, Valery Brinnel, Tim Brooke, Brian Bue, Mattia Bulla, Rick Burruss, S. Bradley Cenko, Chan-Kao Chang, Andrew Connolly, Michael Coughlin, John Cromer, Virginia Cunningham, Kishalay De, Alex Delacroix, Vandana Desai, Dmitry A. Duev, Gwendolyn Eadie, Tony L. Farnham, Michael Feeney, Ulrich Feindt, David Flynn, Anna Franckowiak, S. Frederick, C. Fremling, Avishay Gal-Yam, Suvi Gezari, Daniel A. Goldstein, V. Zach Golkhou, Ariel Goobar, Steven Groom, Eugean Hacopians, David Hale, John Henning, Anna Y. Q. Ho, David Hover, Justin Howell, Tiara Hung, Daniela Huppenkothen, David Imel, Wing-Huen Ip, Željko Ivezić, Edward Jackson, Lynne Jones, Mario Jurić, Mansi M. Kasliwal, S. Kaspi, Stephen Kaye, Michael S. P. Kelley, Marek Kowalski, Emily Kramer, Thomas Kupfer, Walter Landry, Russ R. Laher, Chien-De Lee, Hsing-Wen Lin, Zhong-Yi Lin, Ragnhild Lunnan, Matteo Giomi, Ashish Mahabal, Peter Mao, Adam A. Miller, Serge Monkewitz, Patrick Murphy, Chow-Choong Ngeow, Jakob Nordin, Peter Nugent, Eran Ofek, Maria T. Patterson, Bryan Penprase, Michael Porter, Ludwig Rauch, Umaa Rebbapragada, Dan Reiley, Mickael Rigault, Hector Rodriguez, Jan van Roestel, Ben Rusholme, Jakob van Santen, S. Schulze, David L. Shupe, Leo P. Singer, Maayane T. Soumagnac, Robert Stein, Jason Surace, Jesper Sollerman, Paula Szkody, F. Taddia, Scott Terek, Angela Van Sistine, Sjoert van Velzen, W. Thomas Vestrand, Richard Walters, Charlotte Ward, Quan-Zhi Ye, Po-Chieh Yu, Lin Yan, Jeffry Zolkower

The Zwicky Transient Facility: Data Processing, Products, and Archive

The Zwicky Transient Facility (ZTF) is a new robotic time-domain survey currently in progress using the Palomar 48-inch Schmidt …

Deep Learning for Multi-Messenger Astrophysics: A Gateway for Discovery in the Big Data Era

This report provides an overview of recent work that harnesses the Big Data Revolution and Large Scale Computing to address grand …

2900 square degree search for the optical counterpart of short gamma-ray burst GRB 180523B with the Zwicky Transient Facility

There is significant interest in the models for production of short gamma-ray bursts. Until now, the number of known short gamma-ray …

Optimizing spectroscopic follow-up strategies for supernova photometric classification with active learning

We report a framework for spectroscopic follow-up design for optimizing supernova photometric classification. The strategy accounts for …

The Fast, Luminous Ultraviolet Transient AT2018cow: Extreme Supernova, or Disruption of a Star by an Intermediate-Mass Black Hole?

Wide-field optical surveys have begun to uncover large samples of fast (t_rise < 5d), luminous (M_peak < -18), blue transients. …
Daniel A. Perley, Paolo A. Mazzali, Lin Yan, S. Bradley Cenko, Suvi Gezari, Kirsty Taggart, Nadia Blagorodnova, Christoffer Fremling, Brenna Mockler, Avinash Singh, Nozomu Tominaga, Masaomi Tanaka, Alan M. Watson, Tomás Ahumada, G. C. Anupama, Chris Ashall, Rosa L. Becerra, David Bersier, Varun Bhalerao, Joshua S. Bloom, Nathaniel R. Butler, Chris Copperwheat, Michael W. Coughlin, Kishalay De, Andrew J. Drake, Dmitry A. Duev, Sara Frederick, J. Jesús González, Ariel Goobar, Marianne Heida, Anna Y. Q. Ho, John Horst, Tiara Hung, Ryosuke Itoh, Jacob E. Jencson, Mansi M. Kasliwal, Nobuyuki Kawai, Shrinivas R. Kulkarni, Brajesh Kumar, Harsh Kumar, Alexander S. Kutyrev, Tanazza Khanam, William H. Lee, Keiichi Maeda, Ashish Mahabal, Katsuhiro L. Murata, James D. Neill, Chow-Choong Ngeow, Bryan Penprase, Elena Pian, Robert Quimby, Enrico Ramirez-Ruiz, Michael Richer, Carlos G. Román-Zúñiga, Shubham Srivastava, Quentin Socia, Jesper Sollerman, Yutaro Tachibana, Francesco Taddia, Samaporn Tinyanont, Eleonora Troja, Charlotte Ward, Jerrick Wee

Results of a systematic search for outburst events in 1.4 million galaxies

We present an analysis of nine years of Catalina Surveys optical photometry for 1.4 million spectroscopically confirmed SDSS galaxies. …

The Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC): Selection of a performance metric for classification probabilities balancing diverse science goals

Classification of transient and variable light curves is an essential step in using astronomical observations to develop an …

The Photometric LSST Astronomical Time-series Classification Challenge (PLAsTiCC): Data set

The Photometric LSST Astronomical Time Series Classification Challenge (PLAsTiCC) is an open data challenge to classify simulated …

LSST: from Science Drivers to Reference Design and Anticipated Data Products

(Abridged) We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). A …
Željko Ivezić, Steven M. Kahn, J. Anthony Tyson, Bob Abel, Emily Acosta, Robyn Allsman, David Alonso, Yusra AlSayyad, Scott F. Anderson, John Andrew, James Roger P. Angel, George Z. Angeli, Reza Ansari, Pierre Antilogus, Constanza Araujo, Robert Armstrong, Kirk T. Arndt, Pierre Astier, Éric Aubourg, Nicole Auza, Tim S. Axelrod, Deborah J. Bard, Jeff D. Barr, Aurelian Barrau, James G. Bartlett, Amanda E. Bauer, Brian J. Bauman, Sylvain Baumont, Andrew C. Becker, Jacek Becla, Cristina Beldica, Steve Bellavia, Federica B. Bianco, Rahul Biswas, Guillaume Blanc, Jonathan Blazek, Roger D. Blandford, Josh S. Bloom, Joanne Bogart, Tim W. Bond, Anders W. Borgland, Kirk Borne, James F. Bosch, Dominique Boutigny, Craig A. Brackett, Andrew Bradshaw, William Nielsen Brandt, Michael E. Brown, James S. Bullock, Patricia Burchat, David L. Burke, Gianpietro Cagnoli, Daniel Calabrese, Shawn Callahan, Alice L. Callen, Srinivasan Chandrasekharan, Glenaver Charles-Emerson, Steve Chesley, Elliott C. Cheu, Hsin-Fang Chiang, James Chiang, Carol Chirino, Derek Chow, David R. Ciardi, Charles F. Claver, Johann Cohen-Tanugi, Joseph J. Cockrum, Rebecca Coles, Andrew J. Connolly, Kem H. Cook, Asantha Cooray, Kevin R. Covey, Chris Cribbs, Wei Cui, Roc Cutri, Philip N. Daly, Scott F. Daniel, Felipe Daruich, Guillaume Daubard, Greg Daues, William Dawson, Francisco Delgado, Alfred Dellapenna, Robert de Peyster, Miguel de Val-Borro, Seth W. Digel, Peter Doherty, Richard Dubois, Gregory P. Dubois-Felsmann, Josef Durech, Frossie Economou, Michael Eracleous, Henry Ferguson, Enrique Figueroa, Merlin Fisher-Levine, Warren Focke, Michael D. Foss, James Frank, Michael D. Freemon, Emmanuel Gangler, Eric Gawiser, John C. Geary, Perry Gee, Marla Geha, Charles J. B. Gessner, Robert R. Gibson, D. Kirk Gilmore, Thomas Glanzman, William Glick, Tatiana Goldina, Daniel A. Goldstein, Iain Goodenow, Melissa L. Graham, William J. Gressler, Philippe Gris, Leanne P. Guy, Augustin Guyonnet, Gunther Haller, Ron Harris, Patrick A. Hascall, Justine Haupt, Fabio Hernandez, Sven Herrmann, Edward Hileman, Joshua Hoblitt, John A. Hodgson, Craig Hogan, Dajun Huang, Michael E. Huffer, Patrick Ingraham, Walter R. Innes, Suzanne H. Jacoby, Bhuvnesh Jain, Fabrice Jammes, James Jee, Tim Jenness, Garrett Jernigan, Darko Jevremović, Kenneth Johns, Anthony S. Johnson, Margaret W. G. Johnson, R. Lynne Jones, Claire Juramy-Gilles, Mario Jurić, Jason S. Kalirai, Nitya J. Kallivayalil, Bryce Kalmbach, Jeffrey P. Kantor, Pierre Karst, Mansi M. Kasliwal, Heather Kelly, Richard Kessler, Veronica Kinnison, David Kirkby, Lloyd Knox, Ivan V. Kotov, Victor L. Krabbendam, K. Simon Krughoff, Petr Kubánek, John Kuczewski, Shri Kulkarni, John Ku, Nadine R. Kurita, Craig S. Lage, Ron Lambert, Travis Lange, J. Brian Langton, Laurent Le Guillou, Deborah Levine, Ming Liang, Kian-Tat Lim, Chris J. Lintott, Kevin E. Long, Margaux Lopez, Paul J. Lotz, Robert H. Lupton, Nate B. Lust, Lauren A. MacArthur, Ashish Mahabal, Rachel Mandelbaum, Darren S. Marsh, Philip J. Marshall, Stuart Marshall, Morgan May, Robert McKercher, Michelle McQueen, Joshua Meyers, Myriam Migliore, Michelle Miller, David J. Mills, Connor Miraval, Joachim Moeyens, David G. Monet, Marc Moniez, Serge Monkewitz, Christopher Montgomery, Fritz Mueller, Gary P. Muller, Freddy Muñoz Arancibia, Douglas R. Neill, Scott P. Newbry, Jean-Yves Nief, Andrei Nomerotski, Martin Nordby, Paul O'Connor, John Oliver, Scot S. Olivier, Knut Olsen, William O'Mullane, Sandra Ortiz, Shawn Osier, Russell E. Owen, Reynald Pain, Paul E. Palecek, John K. Parejko, James B. Parsons, Nathan M. Pease, J. Matt Peterson, John R. Peterson, Donald L. Petravick, M. E. Libby Petrick, Cathy E. Petry, Francesco Pierfederici, Stephen Pietrowicz, Rob Pike, Philip A. Pinto, Raymond Plante, Stephen Plate, Paul A. Price, Michael Prouza, Veljko Radeka, Jayadev Rajagopal, Andrew P. Rasmussen, Nicolas Regnault, Kevin A. Reil, David J. Reiss, Michael A. Reuter, Stephen T. Ridgway, Vincent J. Riot, Steve Ritz, Sean Robinson, William Roby, Aaron Roodman, Wayne Rosing, Cecille Roucelle, Matthew R. Rumore, Stefano Russo, Abhijit Saha, Benoit Sassolas, Terry L. Schalk, Pim Schellart, Rafe H. Schindler, Samuel Schmidt, Donald P. Schneider, Michael D. Schneider, William Schoening, German Schumacher, Megan E. Schwamb, Jacques Sebag, Brian Selvy, Glenn H. Sembroski, Lynn G. Seppala, Andrew Serio, Eduardo Serrano, Richard A. Shaw, Ian Shipsey, Jonathan Sick, Nicole Silvestri, Colin T. Slater, J. Allyn Smith, R. Chris Smith, Shahram Sobhani, Christine Soldahl, Lisa Storrie-Lombardi, Edward Stover, Michael A. Strauss, Rachel A. Street, Christopher W. Stubbs, Ian S. Sullivan, Donald Sweeney, John D. Swinbank, Alexander Szalay, Peter Takacs, Stephen A. Tether, Jon J. Thaler, John Gregg Thayer, Sandrine Thomas, Vaikunth Thukral, Jeffrey Tice, David E. Trilling, Max Turri, Richard Van Berg, Daniel Vanden Berk, Kurt Vetter, Francoise Virieux, Tomislav Vucina, William Wahl, Lucianne Walkowicz, Brian Walsh, Christopher W. Walter, Daniel L. Wang, Shin-Yawn Wang, Michael Warner, Oliver Wiecha, Beth Willman, Scott E. Winters, David Wittman, Sidney C. Wolff, W. Michael Wood-Vasey, Xiuqin Wu, Bo Xin, Peter Yoachim, Hu Zhan

Summarizing performance for genome scale measurement of miRNA: reference samples and metrics

Background: The potential utility of microRNA as biomarkers for early detection of cancer and other diseases is being investigated with …

MALS-NOT: Identifying Radio-Bright Quasars for the MeerKAT Absorption Line Survey

We present a preparatory spectroscopic survey to identify radio-bright, high-redshift quasars for the MeerKAT Absorption Line Survey …

RoboPol: Connection between optical polarization plane rotations and gamma-ray flares in blazars

We use results of our 3 year polarimetric monitoring program to investigate the previously suggested connection between rotations of …

Effective Image Differencing with ConvNets for Real-time Transient Hunting

Large sky surveys are increasingly relying on image subtraction pipelines for real-time (and archival) transient detection. In this …

Deep-Learnt Classification of Light Curves

Astronomy light curves are sparse, gappy, and heteroscedastic. As a result standard time series methods regularly used for financial …

The MeerKAT Absorption Line Survey (MALS)

Deep galaxy surveys have revealed that the global star formation rate (SFR) density in the Universe peaks at 1 < z < 2 and …

`Zwicky's Nonet': a compact merging ensemble of nine galaxies and 4C 35.06, a peculiar radio galaxy with dancing radio jets

We report the results of our radio, optical and infra-red studies of a peculiar radio source 4C~35.06, an extended radio-loud AGN at …

Science-Driven Optimization of the LSST Observing Strategy

The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of …
LSST Science Collaboration, Phil Marshall, Timo Anguita, Federica B. Bianco, Eric C. Bellm, Niel Brandt, Will Clarkson, Andy Connolly, Eric Gawiser, Željko Ivezić, Lynne Jones, Michelle Lochner, Michael B. Lund, Ashish Mahabal, David Nidever, Knut Olsen, Stephen Ridgway, Jason Rhodes, Ohad Shemmer, David Trilling, Kathy Vivas, Lucianne Walkowicz, Beth Willman, Peter Yoachim, Scott Anderson, Pierre Antilogus, Ruth Angus, Iair Arcavi, Humna Awan, Rahul Biswas, Keaton J. Bell, David Bennett, Chris Britt, Derek Buzasi, Dana I. Casetti-Dinescu, Laura Chomiuk, Chuck Claver, Kem Cook, James Davenport, Victor Debattista, Seth Digel, Zoheyr Doctor, R. E. Firth, Ryan Foley, Wen-fai Fong, Lluis Galbany, Mark Giampapa, John E. Gizis, Melissa L. Graham, Carl Grillmair, Phillipe Gris, Zoltan Haiman, Patrick Hartigan, Suzanne Hawley, Renee Hlozek, Saurabh W. Jha, C. Johns-Krull, Shashi Kanbur, Vassiliki Kalogera, Vinay Kashyap, Vishal Kasliwal, Richard Kessler, Alex Kim, Peter Kurczynski, Ofer Lahav, Michael C. Liu, Alex Malz, Raffaella Margutti, Tom Matheson, Jason D. McEwen, Peregrine McGehee, Soren Meibom, Josh Meyers, Dave Monet, Eric Neilsen, Jeffrey Newman, Matt O'Dowd, Hiranya V. Peiris, Matthew T. Penny, Christina Peters, Radoslaw Poleski, Kara Ponder, Gordon Richards, Jeonghee Rho, David Rubin, Samuel Schmidt, Robert L. Schuhmann, Avi Shporer, Colin Slater, Nathan Smith, Marcelles Soares-Santos, Keivan Stassun, Jay Strader, Michael Strauss, Rachel Street, Christopher Stubbs, Mark Sullivan, Paula Szkody, Virginia Trimble, Tony Tyson, Miguel de Val-Borro, Stefano Valenti, Robert Wagoner, W. Michael Wood-Vasey, Bevin Ashley Zauderer

Long-term Periodicities of Cataclysmic Variables with Synoptic Surveys

A systematic study on the long-term periodicities of known Galactic cataclysmic variables (CVs) was conducted. Among 1580 known CVs, …

Understanding extreme quasar optical variability with CRTS: I. Major AGN flares

There is a large degree of variety in the optical variability of quasars and it is unclear whether this is all attributable to a single …

Extreme Variability in a Broad Absorption Line Quasar

CRTS J084133.15+200525.8 is an optically bright quasar at z=2.345 that has shown extreme spectral variability over the past decade. …

Clustering on very small scales from a large sample of confirmed quasar pairs: Does quasar clustering track from Mpc to kpc scales?

We present the most precise estimate to date of the clustering of quasars on very small scales, based on a sample of 47 binary quasars …

From Sky to Earth: Data Science Methodology Transfer

We describe here the parallels in astronomy and earth science datasets, their analyses, and the opportunities for methodology transfer …

Detection of quasars in the time domain

The time domain is the emerging forefront of astronomical research with new facilities and instruments providing unprecedented amounts …

RoboPol: The optical polarization of gamma-ray--loud and gamma-ray--quiet blazars

We present average R-band optopolarimetric data, as well as variability parameters, from the first and second RoboPol observing season. …

RoboPol: Do optical polarization rotations occur in all blazars?

We present a new set of optical polarization plane rotations in blazars, observed during the third year of operation of RoboPol. The …

Optical polarization map of the Polaris Flare with RoboPol

The stages before the formation of stars in molecular clouds are poorly understood. Insights can be gained by studying the properties …

Real-Time Data Mining of Massive Data Streams from Synoptic Sky Surveys

The nature of scientific and technological data collection is evolving rapidly: data volumes and rates grow exponentially, with …

RoboPol: optical polarization-plane rotations and flaring activity in blazars

We present measurements of rotations of the optical polarization of blazars during the second year of operation of RoboPol, a …

From Stars to Patients: Lessons from Space Science and Astrophysics for Health Care Informatics

Big Data are revolutionizing nearly every aspect of the modern society. One area where this can have a profound positive societal …

Gamma rays from the quasar PKS 1441+25: story of an escape

Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse …
A. U. Abeysekara, S. Archambault, A. Archer, T. Aune, A. Barnacka, W. Benbow, R. Bird, J. Biteau, J. H. Buckley, V. Bugaev, J. V Cardenzana, M. Cerruti, X. Chen, J. L. Christiansen, L. Ciupik, M. P. Connolly, P. Coppi, W. Cui, H. J. Dickinson, J. Dumm, J. D. Eisch, M. Errando, A. Falcone, Q. Feng, J. P. Finley, H. Fleischhack, A. Flinders, P. Fortin, L. Fortson, A. Furniss, G. H. Gillanders, S. Griffin, J. Grube, G. Gyuk, M. Hütten, N. Håkansson, D. Hanna, J. Holder, T. B. Humensky, C. A. Johnson, P. Kaaret, P. Kar, N. Kelley-Hoskins, Y. Khassen, D. Kieda, M. Krause, F. Krennrich, S. Kumar, M. J. Lang, G. Maier, S. McArthur, A. McCann, K. Meagher, P. Moriarty, R. Mukherjee, D. Nieto, A. O'Faoláin de Bhróithe, R. A. Ong, A. N. Otte, N. Park, J. S. Perkins, A. Petrashyk, M. Pohl, A. Popkow, E. Pueschel, J. Quinn, K. Ragan, G. Ratliff, P. T. Reynolds, G. T. Richards, E. Roache, J. Rousselle, M. Santander, G. H. Sembroski, K. Shahinyan, A. W. Smith, D. Staszak, I. Telezhinsky, N. W. Todd, J. V. Tucci, J. Tyler, V. V. Vassiliev, S. Vincent, S. P. Wakely, O. M. Weiner, A. Weinstein, A. Wilhelm, D. A. Williams, B. Zitzer, P. S. Smith, T. W. -S. Holoien, J. L. Prieto, C. S. Kochanek, K. Z. Stanek, B. Shappee, T. Hovatta, W. Max-Moerbeck, T. J. Pearson, R. A. Reeves, J. L. Richards, A. C. S. Readhead, G. M. Madejski, S. G. Djorgovski, A. J. Drake, M. J. Graham, A. Mahabal

Bigger Buffer k-d Trees on Multi-Many-Core Systems

A buffer k-d tree is a k-d tree variant for massively-parallel nearest neighbor search. While providing valuable speed-ups on modern …

Infrared Time Lags for the Periodic Quasar PG 1302-102

The optical light curve of the quasar PG 1302-102 at $z = 0.278$ shows a strong, smooth 5.2 yr periodic signal, detectable over a …

Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429

PSR J2129-0429 is a arcsecredback arcsec eclipsing millisecond pulsar binary with an unusually long 15.2 hour orbit. It was discovered …

A systematic search for close supermassive black hole binaries in the Catalina Real-Time Transient Survey

Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These are not resolvable by direct …

Total eclipse of the heart: The AM CVn Gaia14aae / ASSASN-14cn

We report the discovery and characterisation of a deeply eclipsing AM CVn-system, Gaia14aae (= ASSASN-14cn). Gaia14aae was identified …
H. C. Campbell, T. R. Marsh, M. Fraser, S. T. Hodgkin, E. de Miguel, B. T. Gänsicke, D. Steeghs, A. Hourihane, E. Breedt, S. P. Littlefair, S. E. Koposov, L. Wyrzykowski, G. Altavilla, N. Blagorodnova, G. Clementini, G. Damljanovic, A. Delgado, M. Dennefeld, A. J. Drake, J. Fernández-Hernández, G. Gilmore, R. Gualandi, A. Hamanowicz, B. Handzlik, L. K. Hardy, D. L. Harrison, K. Ilkiewicz, P. G. Jonker, C. S. Kochanek, Z. Kolaczkowski, Z. Kostrzewa-Rutkowska, R. Kotak, G. van Leeuwen, G. Leto, P. Ochner, M. Pawlak, L. Palaversa, G. Rixon, K. Rybicki, B. J. Shappee, S. J. Smartt, M. A. P. Torres, L. Tomasella, M. Turatto, K. Ulaczyk, S. van Velzen, O. Vince, N. A. Walton, P. Wielgórski, T. Wevers, P. Whitelock, A. Yoldas, F. De Angeli, P. Burgess, G. Busso, R. Busuttil, T. Butterley, K. C. Chambers, C. Copperwheat, A. B. Danilet, V. S. Dhillon, D. W. Evans, L. Eyer, D. Froebrich, A. Gomboc, G. Holland, T. W. -S. Holoien, J. F. Jarvis, N. Kaiser, D. A. Kann, D. Koester, U. Kolb, S. Komossa, E. A. Magnier, A. Mahabal, J. Polshaw, J. L. Prieto, T. Prusti, M. Riello, A. Scholz, G. Simonian, K. Z. Stanek, L. Szabados, C. Waters, R. W. Wilson

AstroStat - A VO Tool for Statistical Analysis

AstroStat is an easy-to-use tool for performing statistical analysis on data. It has been designed to be compatible with Virtual …

A possible close supermassive black-hole binary in a quasar with optical periodicity

Quasars have long been known to be variable sources at all wavelengths. Their optical variability is stochastic, can be due to a …

A serendipitous all sky survey for bright objects in the outer solar system

We use seven year’s worth of observations from the Catalina Sky Survey and the Siding Spring Survey covering most of the northern …

Immersive and Collaborative Data Visualization Using Virtual Reality Platforms

Effective data visualization is a key part of the discovery process in the era of big data. It is the bridge between the quantitative …

Discovery of ~ 9,000 new RR Lyrae in the Southern Catalina Surveys

We present the results of a deep, wide-area variability survey in the Southern hemisphere, the first of its kind. As part of the …

Automated Real-Time Classification and Decision Making in Massive Data Streams from Synoptic Sky Surveys

The nature of scientific and technological data collection is evolving rapidly: data volumes and rates grow exponentially, with …

Modeling Light Curves for Improved Classification

Many synoptic surveys are observing large parts of the sky multiple times. The resulting lightcurves provide a wonderful window to the …

Ultra-short Period Binaries from the Catalina Surveys

We investigate the properties of 367 ultra-short period binary candidates selected from 31,000 sources recently identified from …

DAMEWARE: A web cyberinfrastructure for astrophysical data mining

Astronomy is undergoing through a methodological revolution triggered by an unprecedented wealth of complex and accurate data. The new …

The Catalina Surveys Periodic Variable Star Catalog

We present ~47,000 periodic variables found during the analysis of 5.4 million variable star candidates within a 20,000 square degree …

Cataclysmic Variables from the Catalina Real-time Transient Survey

We present 855 cataclysmic variable candidates detected by the Catalina Real-time Transient Survey (CRTS) of which at least 137 have …

Variability in Low Ionization Broad Absorption Line Outflows

We present results of our time variability studies of Mg II and Al III absorption lines in a sample of 22 Low Ionization Broad …

10 Simple Rules for the Care and Feeding of Scientific Data

This article offers a short guide to the steps scientists can take to ensure that their data and associated analyses continue to be of …

Connection between optical and gamma-ray variability in blazars

We use optical data from the Palomar Transient Factory (PTF) and the Catalina Real-Time Transient Survey (CRTS) to study the …

A novel variability-based method for quasar selection: evidence for a rest frame ~54 day characteristic timescale

We compare quasar selection techniques based on their optical variability using data from the Catalina Real-time Transient Survey …

Feature Selection Strategies for Classifying High Dimensional Astronomical Data Sets

The amount of collected data in many scientific fields is increasing, all of them requiring a common task: extract knowledge from …

Dust Reddened Quasars in FIRST and UKIDSS: Beyond the Tip of the Iceberg

We present the results of a pilot survey to find dust-reddened quasars by matching the FIRST radio catalog to the UKIDSS near-infrared …

A plausible (overlooked) super-luminous supernova in the SDSS Stripe 82 data

We present the discovery of a plausible super-luminous supernova (SLSN), found in the archival data of Sloan Digital Sky Survey (SDSS) …

A comparison of period finding algorithms

This paper presents a comparison of popular period finding algorithms applied to the light curves of variable stars from the Catalina …

Using conditional entropy to identify periodicity

This paper presents a new period finding method based on conditional entropy that is both efficient and accurate. We demonstrate its …

Machine-assisted discovery of relationships in astronomy

High-volume feature-rich data sets are becoming the bread-and-butter of 21st century astronomy but present significant challenges to …

The MICA Experiment: Astrophysics in Virtual Worlds

We describe the work of the Meta-Institute for Computational Astrophysics (MICA), the first professional scientific organization based …

Evidence for a Milky Way Tidal Stream Reaching Beyond 100 kpc

We present the analysis of 1,207 RR Lyrae found in photometry taken by the Catalina Survey’s Mount Lemmon telescope. By combining …

Classification by Boosting Differences in Input Vectors: An application to datasets from Astronomy

There are many occasions when one does not have complete information in order to classify objects into different classes, and yet it is …

Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys

We present the analysis of 12227 type-ab RR Lyrae found among the 200 million public lightcurves in the Catalina Surveys Data Release 1 …

Flashes in a Star Stream: Automated Classification of Astronomical Transient Events

An automated, rapid classification of transient events detected in the modern synoptic sky surveys is essential for their scientific …

Data challenges of time domain astronomy

Astronomy has been at the forefront of the development of the techniques and methodologies of data intensive science for over a decade …

FIRST-2MASS Red Quasars: Transitional Objects Emerging from the Dust

We present a sample of 120 dust-reddened quasars identified by matching radio sources detected at 1.4 GHz in the FIRST survey with the …

Connecting the time domain community with the Virtual Astronomical Observatory

The time domain has been identified as one of the most important areas of astronomical research for the next decade. The Virtual …

Sky Surveys

Sky surveys represent a fundamental data basis for astronomy. We use them to map in a systematic way the universe and its constituents, …

Probing the time variability of five Fe low broad absorption line quasars

We study the time variability of five Fe Low ionization Broad Absorption Line (FeLoBAL) QSOs using repeated spectroscopic observations …

Astronomy with Cutting-Edge ICT: From Transients in the Sky to Data over the Continents (India-US)

Astronomy has always been at the forefront of information technology, moving from the era of photographic plates, to digital snapshots …

Dynamically evolving Mg II broad absorption line flow in SDSS J133356.02+001229.1

We report a dynamically evolving low ionization broad absorption line flow in the QSO SDSS J133356.02+001229.1 (at z_em = 0.9197). …

The DAME/VO-Neural Infrastructure: an Integrated Data Mining System Support for the Science Community

Astronomical data are gathered through a very large number of heterogeneous techniques and stored in very diversified and often …

Real Time Classification of Transient Events in Synoptic Sky Surveys

An automated, rapid classification of transient events detected in the modern synoptic sky surveys is essential for their scientific …

The Catalina Real-time Transient Survey

The Catalina Real-time Transient Survey (CRTS) currently covers 33,000 deg^2 of the sky in search of transient astrophysical events, …

The VAO Transient Facility

The time domain community wants robust and reliable tools to enable production of and subscription to community-endorsed event …

Exploring the Time Domain With Synoptic Sky Surveys

Synoptic sky surveys are becoming the largest data generators in astronomy, and they are opening a new research frontier, that touches …

Discovery, classification, and scientific exploration of transient events from the Catalina Real-time Transient Survey

Exploration of the time domain - variable and transient objects and phenomena - is rapidly becoming a vibrant research frontier, …

Three QSOs acting as strong gravitational lenses

We report the discovery of three new cases of QSOs acting as strong gravitational lenses on background emission line galaxies: SDSS …

Towards an Automated Classification of Transient Events in Synoptic Sky Surveys

We describe the development of a system for an automated, iterative, real-time classification of transient events discovered in …

Modeling of the HERMES J105751.1+573027 submillimeter source lensed by a dark matter dominated foreground group of galaxies

We present the results of a gravitational lensing analysis of the bright $zs=2.957$ sub-millimeter galaxy (SMG), HERMES …
R. Gavazzi, A. Cooray, A. Conley, J. E. Aguirre, A. Amblard, R. Auld, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge, D. Brisbin, D. Burgarella, P. Chanial, E. Chapin, N. Christopher, D. L. Clements, P. Cox, S. G. Djorgovski, C. D. Dowell, S. Eales, L. Earle, T. P. Ellsworth-Bowers, D. Farrah, A. Franceschini, H. Fu, J. Glenn, E. A. González Solares, M. Griffin, M. A. Gurwell, M. Halpern, E. Ibar, R. J. Ivison, M. Jarvis, J. Kamenetzky, S. Kim, M. Krips, L. Levenson, R. Lupu, A. Mahabal, P. D. Maloney, C. Maraston, L. Marchetti, G. Marsden, H. Matsuhara, A. M. J. Mortier, E. Murphy, B. J. Naylor, R. Neri, H. T. Nguyen, S. J. Oliver, A. Omont, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Pérez-Fournon, M. Pohlen, N. Rangwala, J. I. Rawlings, G. Raymond, D. Riechers, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, B. Schulz, Douglas Scott, K. S. Scott, P. Serra, N. Seymour, D. L. Shupe, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, E. Valiante, I. Valtchanov, A. Verma, J. D. Vieira, L. Vigroux, L. Wang, J. Wardlow, D. Wiebe, G. Wright, C. K. Xu, G. Zeimann, M. Zemcov, J. Zmuidzinas

Discovery of a Multiply-Lensed Submillimeter Galaxy in Early HerMES Herschel/SPIRE Data

We report the discovery of a bright ($f(250mum) > 400$ mJy), multiply-lensed submillimeter galaxy obj in {it Herschel}/SPIRE …
A. Conley, A. Cooray, J. D. Vieira, E. A. González Solares, S. Kim, J. E. Aguirre, A. Amblard, R. Auld, A. J. Baker, A. Beelen, A. Blain, R. Blundell, J. Bock, C. M. Bradford, C. Bridge, D. Brisbin, D. Burgarella, J. M. Carpenter, P. Chanial, E. Chapin, N. Christopher, D. L. Clements, P. Cox, S. G. Djorgovski, C. D. Dowell, S. Eales, L. Earle, T. P. Ellsworth-Bowers, D. Farrah, A. Franceschini, D. Frayer, H. Fu, R. Gavazzi, J. Glenn, M. Griffin, M. A. Gurwell, M. Halpern, E. Ibar, R. J. Ivison, M. Jarvis, J. Kamenetzky, M. Krips, L. Levenson, R. Lupu, A. Mahabal, P. D. Maloney, C. Maraston, L. Marchetti, G. Marsden, H. Matsuhara, A. M. J. Mortier, E. Murphy, B. J. Naylor, R. Neri, H. T. Nguyen, S. J. Oliver, A. Omont, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Pérez-Fournon, M. Pohlen, N. Rangwala, J. I. Rawlings, G. Raymond, D. Riechers, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, B. Schulz, Douglas Scott, K. Scott, P. Serra, N. Seymour, D. L. Shupe, A. J. Smith, M. Symeonidis, K. E. Tugwell, M. Vaccari, E. Valiante, I. Valtchanov, A. Verma, M. P. Viero, L. Vigroux, L. Wang, D. Wiebe, G. Wright, C. K. Xu, G. Zeimann, M. Zemcov, J. Zmuidzinas

The Discovery and Nature of Optical Transient CSS100217:102913+404220

We report on the discovery and observations of the extremely luminous optical transient CSS100217:102913+404220 (CSS100217 hereafter). …

The Catalina Real-Time Transient Survey (CRTS)

Catalina Real-Time Transient Survey (CRTS) is a synoptic sky survey uses data streams from 3 wide-field telescopes in Arizona and …

DAME: A Web Oriented Infrastructure for Scientific Data Mining & Exploration

Nowadays, many scientific areas share the same need of being able to deal with massive and distributed datasets and to perform on them …

Results from the Supernova Photometric Classification Challenge

We report results from the Supernova Photometric Classification Challenge (SNPCC), a publicly released mix of simulated supernovae …

Discovery of eclipsing white dwarf systems in a search for Earth-size companions

Although white dwarfs are believed to be the end point of most stellar evolution, unlike main sequence stars, they have not yet been …

First case of strong gravitational lensing by a QSO : SDSS J0013+1523 at z = 0.120

We present the first case of strong gravitational lensing by a QSO : SDSS J0013+1523, at z = 0.120. The discovery is the result of a …

The Faint End of the Quasar Luminosity Function at z~4

We have conducted a spectroscopic survey to find faint quasars (-26.0 < M_{1450} < -22.0) at redshifts z=3.8-5.2 in order to …

LSST Science Book, Version 2.0

A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of the …
LSST Science Collaboration, Paul A. Abell, Julius Allison, Scott F. Anderson, John R. Andrew, J. Roger P. Angel, Lee Armus, David Arnett, S. J. Asztalos, Tim S. Axelrod, Stephen Bailey, D. R. Ballantyne, Justin R. Bankert, Wayne A. Barkhouse, Jeffrey D. Barr, L. Felipe Barrientos, Aaron J. Barth, James G. Bartlett, Andrew C. Becker, Jacek Becla, Timothy C. Beers, Joseph P. Bernstein, Rahul Biswas, Michael R. Blanton, Joshua S. Bloom, John J. Bochanski, Pat Boeshaar, Kirk D. Borne, Marusa Bradac, W. N. Brandt, Carrie R. Bridge, Michael E. Brown, Robert J. Brunner, James S. Bullock, Adam J. Burgasser, James H. Burge, David L. Burke, Phillip A. Cargile, Srinivasan Chandrasekharan, George Chartas, Steven R. Chesley, You-Hua Chu, David Cinabro, Mark W. Claire, Charles F. Claver, Douglas Clowe, A. J. Connolly, Kem H. Cook, Jeff Cooke, Asantha Cooray, Kevin R. Covey, Christopher S. Culliton, Roelof de Jong, Willem H. de Vries, Victor P. Debattista, Francisco Delgado, Ian P. Dell'Antonio, Saurav Dhital, Rosanne Di Stefano, Mark Dickinson, Benjamin Dilday, S. G. Djorgovski, Gregory Dobler, Ciro Donalek, Gregory Dubois-Felsmann, Josef Durech, Ardis Eliasdottir, Michael Eracleous, Laurent Eyer, Emilio E. Falco, Xiaohui Fan, Christopher D. Fassnacht, Harry C. Ferguson, Yanga R. Fernandez, Brian D. Fields, Douglas Finkbeiner, Eduardo E. Figueroa, Derek B. Fox, Harold Francke, James S. Frank, Josh Frieman, Sebastien Fromenteau, Muhammad Furqan, Gaspar Galaz, A. Gal-Yam, Peter Garnavich, Eric Gawiser, John Geary, Perry Gee, Robert R. Gibson, Kirk Gilmore, Emily A. Grace, Richard F. Green, William J. Gressler, Carl J. Grillmair, Salman Habib, J. S. Haggerty, Mario Hamuy, Alan W. Harris, Suzanne L. Hawley, Alan F. Heavens, Leslie Hebb, Todd J. Henry, Edward Hileman, Eric J. Hilton, Keri Hoadley, J. B. Holberg, Matt J. Holman, Steve B. Howell, Leopoldo Infante, Željko Ivezić, Suzanne H. Jacoby, Bhuvnesh Jain, R, Jedicke, M. James Jee, J. Garrett Jernigan, Saurabh W. Jha, Kathryn V. Johnston, R. Lynne Jones, Mario Jurić, Mikko Kaasalainen, Styliani, Kafka, Steven M. Kahn, Nathan A. Kaib, Jason Kalirai, Jeff Kantor, Mansi M. Kasliwal, Charles R. Keeton, Richard Kessler, Zoran Knezevic, Adam Kowalski, Victor L. Krabbendam, K. Simon Krughoff, Shrinivas Kulkarni, Stephen Kuhlman, Mark Lacy, Sebastien Lepine, Ming Liang, Amy Lien, Paulina Lira, Knox S. Long, Suzanne Lorenz, Jennifer M. Lotz, R. H. Lupton, Julie Lutz, Lucas M. Macri, Ashish A. Mahabal, Rachel Mandelbaum, Phil Marshall, Morgan May, Peregrine M. McGehee, Brian T. Meadows, Alan Meert, Andrea Milani, Christopher J. Miller, Michelle Miller, David Mills, Dante Minniti, David Monet, Anjum S. Mukadam, Ehud Nakar, Douglas R. Neill, Jeffrey A. Newman, Sergei Nikolaev, Martin Nordby, Paul O'Connor, Masamune Oguri, John Oliver, Scot S. Olivier, Julia K. Olsen, Knut Olsen, Edward W. Olszewski, Hakeem Oluseyi, Nelson D. Padilla, Alex Parker, Joshua Pepper, John R. Peterson, Catherine Petry, Philip A. Pinto, James L. Pizagno, Bogdan Popescu, Andrej Prsa, Veljko Radcka, M. Jordan Raddick, Andrew Rasmussen, Arne Rau, Jeonghee Rho, James E. Rhoads, Gordon T. Richards, Stephen T. Ridgway, Brant E. Robertson, Rok Roskar, Abhijit Saha, Ata Sarajedini, Evan Scannapieco, Terry Schalk, Rafe Schindler, Samuel Schmidt, Sarah Schmidt, Donald P. Schneider, German Schumacher, Ryan Scranton, Jacques Sebag, Lynn G. Seppala, Ohad Shemmer, Joshua D. Simon, M. Sivertz, Howard A. Smith, J. Allyn Smith, Nathan Smith, Anna H. Spitz, Adam Stanford, Keivan G. Stassun, Jay Strader, Michael A. Strauss, Christopher W. Stubbs, Donald W. Sweeney, Alex Szalay, Paula Szkody, Masahiro Takada, Paul Thorman, David E. Trilling, Virginia Trimble, Anthony Tyson, Richard Van Berg, Daniel Vanden Berk, Jake VanderPlas, Licia Verde, Bojan Vrsnak, Lucianne M. Walkowicz, Benjamin D. Wandelt, Sheng Wang, Yun Wang, Michael Warner, Risa H. Wechsler, Andrew A. West, Oliver Wiecha, Benjamin F. Williams, Beth Willman, David Wittman, Sidney C. Wolff, W. Michael Wood-Vasey, Przemek Wozniak, Patrick Young, Andrew Zentner, Hu Zhan

Discovery of the Extremely Energetic Supernova 2008fz

We report on the discovery and initial observations of the energetic type IIn supernova (SN), 2008fz. The optical energy emitted by SN …

Highly Variable Objects in the Palomar-QUEST Survey: A Blazar Search using Optical Variability

We identify 3,113 highly variable objects in 7,200 square degrees of the Palomar-QUEST Survey, which each varied by more than 0.4 …

Binary Quasars at High Redshift II: Sub-Mpc Clustering at z ~ 3-4

We present measurements of the small-scale (0.1<~ r <~ 1 Mpc/h) quasar two-point correlation function at z>2.9, for a …

Binary Quasars at High Redshift I: 24 New Quasar Pairs at z ~ 3-4

The clustering of quasars on small scales yields fundamental constraints on models of quasar evolution and the buildup of supermassive …

Skyalert: Real-time Astronomy for You and Your Robots

Skyalert.org is a web application to collect and disseminate observations about time-critical astronomical transients, and to add …

The Environments of High Redshift QSOs

We present a sample of $i{775}$-dropout candidates identified in five Hubble Advanced Camera for Surveys fields centered on Sloan …

New Approaches to Object Classification in Synoptic Sky Surveys

Digital synoptic sky surveys pose several new object classification challenges. In surveys where real-time detection and classification …

Towards Real-time Classification of Astronomical Transients

Exploration of time domain is now a vibrant area of research in astronomy, driven by the advent of digital synoptic sky surveys. While …

First Results from the Catalina Real-time Transient Survey

We report on the results from the first six months of the Catalina Real-time Transient Survey (CRTS). In order to search for optical …

An Exploratory Search for z~6 Quasars in the UKIDSS Early Data Release

We conducted an exploratory search for quasars at z~ 6 - 8, using the Early Data Release from United Kingdom Infrared Deep Sky survey …

Automated Probabilistic Classification of Transients and Variables

There is an increasing number of large, digital, synoptic sky surveys, in which repeated observations are obtained over large areas of …

The Palomar-Quest Digital Synoptic Sky Survey

We describe briefly the Palomar-Quest (PQ) digital synoptic sky survey, including its parameters, data processing, status, and plans. …

Discovery of Two Spectroscopically Peculiar, Low-Luminosity Quasars at z~4

We report the discovery of two low-luminosity quasars at z~4, both of which show prominent N IV] 1486A emission. This line is extremely …

Discovery of a Probable Physical Triple Quasar

We report the discovery of the first known probable case of a physical triple quasar (not a gravitational lens). A previously known …

Object detection in multi-epoch data

In astronomy multiple images are frequently obtained at the same position of the sky for follow-up co-addition as it helps one go …

Some Pattern Recognition Challenges in Data-Intensive Astronomy

We review some of the recent developments and challenges posed by the data analysis in modern digital sky surveys, which are …

X-ray Galaxy Clusters in NoSOCS: Substructure and the Correlation of Optical and X-ray Properties

We present a comparison of optical and X-ray properties of galaxy clusters in the northern sky. We determine the recovery rate of X-ray …

Discovery of an Optically-Faint Quasar at z=5.70 and Implications for the Faint End of the Quasar Luminosity Function

We present observations of an optically-faint quasar, RD J114816.2+525339, discovered from deep multi-color observations of the field …

Quasars as Probes of Late Reionization and Early Structure Formation

Observations of QSOs at z ~ 5.7 - 6.4 show the appearance of Gunn-Peterson troughs around z ~ 6, and a change in the slope of the IGM …

Evidence for Primordial Clustering Around the QSO SDSS J1030+0524 at z=6.28

We present tentative evidence for primordial clustering, manifested as an excess of color-selected objects in the field of the QSO SDSS …

Time Domain Explorations With Digital Sky Surveys

One of the new frontiers of astronomical research is the exploration of time variability on the sky at different wavelengths and flux …

Grist: Grid-based Data Mining for Astronomy

The Grist project (http://grist.caltech.edu/) is developing a grid-technology based system as a research environment for astronomy with …

Exploring the Time Domain with the Palomar-QUEST Sky Survey

Exploration of the time variability on the sky over a broad range of flux levels and wavelengths is rapidly becoming a new frontier of …

The Northern Sky Optical Cluster Survey IV: An Intermediate Redshift Galaxy Cluster Catalog and the Comparison of Two Detection Algorithms

We present an optically selected galaxy cluster catalog from ~ 2,700 square degrees of the Digitized Second Palomar Observatory Sky …

Palomar-QUEST: A case study in designing sky surveys in the VO era

The advent of wide-area multicolour synoptic sky surveys is leading to data sets unprecedented in size, complexity and data throughput. …

Discovery of a Clustered Quasar Pair at z ~ 5: Biased Peaks in Early Structure Formation

We report a discovery of a quasar at z = 4.96 +- 0.03 within a few Mpc of the quasar SDSS 0338+0021 at z = 5.02 +- 0.02. The newly …

Peculiar Broad Absorption Line Quasars found in DPOSS

With the recent release of large (i.e., > hundred million objects), well-calibrated photometric surveys, such as DPOSS, 2MASS, and …

A Molecular Einstein Ring: Imaging a Starburst Disk Surrounding a Quasi-Stellar Object

Images of the CO 2-1 line emission, and the radio continuum emission, from the redshift 4.12 gravitationally lensed quasi-stellar …

A New Sample of Distant Compact Groups From DPOSS

We have identified eighty-four small, high density groups of galaxies out to z ~ 0.2 in a region of ~ 2000 square degrees around the …

A Limit on the Number of Isolated Neutron Stars Detected in the ROSAT Bright Source Catalog

The challenge in searching for non-radio-pulsing isolated neutron stars (INSs) is in excluding association with objects in the very …

Cosmological Uses of Gamma-Ray Bursts

Studies of the cosmic gamma-ray bursts (GRBs) and their host galaxies are starting to provide interesting or even unique new insights …

The Cosmic Gamma-Ray Bursts and Their Host Galaxies in a Cosmological Context

Studies of the cosmic gamma-ray bursts (GRBs) and their host galaxies are now starting to provide interesting or even unique new …

The Northern Sky Optical Cluster Survey II: An Objective Cluster Catalog for 5800 Square Degrees

We present a new, objectively defined catalog of candidate galaxy clusters based on the galaxy catalogs from the Digitized Second …

Topic maps for custom viewing of data

A Topic Map is a structured network of hyperlinks that points into an information pool. Topic Maps have an existence independent of the …

The Digitized Second Palomar Observatory Sky Survey (DPOSS) II: Photometric Calibration

We present the photometric calibration technique for the Digitized Second Palomar Observatory Sky Survey (DPOSS), used to create …

Challenges for Cluster Analysis in a Virtual Observatory

There has been an unprecedented and continuing growth in the volume, quality, and complexity of astronomical data sets over the past …

GRB 010921: Discovery of the First HETE Afterglow

We report the discovery of the optical and radio afterglow of GRB 010921, the first gamma-ray burst afterglow to be found from a …

The Unusually Long Duration Gamma-ray Burst GRB 000911

Of all the well localized gamma-ray bursts, GRB 000911 has the longest duration (T_90 ~ 500 s), and ranks in the top 1% of BATSE bursts …

Topic Maps as a Virtual Observatory tool

One major component of the VO will be catalogs measuring gigabytes and terrabytes if not more. Some mechanism like XML will be used for …

On the Threshold of the Reionization Epoch

Discovery of the cosmic reionization epoch would represent a significant milestone in cosmology. We present Keck spectroscopy of the …

Exploration of Parameter Spaces in a Virtual Observatory

Like every other field of intellectual endeavor, astronomy is being revolutionised by the advances in information technology. There is …

Exploration of Large Digital Sky Surveys

We review some of the scientific opportunities and technical challenges posed by the exploration of the large digital sky surveys, in …

Searches for Rare and New Types of Objects

Systematic exploration of the observable parameter space, covered by large digital sky surveys spanning a range of wavelengths, will be …

Exploring the Multi-Wavelength, Low Surface Brightness Universe

Our current understanding of the low surface brightness universe is quite incomplete, not only in the optical, but also in other …

Effective Radii and Color Gradients in Radio Galaxies

We present de Vaucouleurs’ effective radii in B and R bands for a sample of Molonglo Reference Catalogue radio galaxies and a …

A Dust Lane in the Radio galaxy 3C270

We present broad band surface photometry of the radio galaxy 3C270 (NGC~4261). We find a distinct dust lane in the $V-R$ image of the …