The Zwicky Transient Facility: Science Objectives
Matthew J. Graham,Shrinivas R. Kulkarni,Eric C. Bellm,Scott M. Adams,Cristina Barbarino,Nadejda Blagorodnova,Dennis Bodewits,Bryce Bolin,Patrick Brady,S. Bradley Cenko,Chan-Kao Chang,Michael W. Coughlin,Kaushik De,Gwendolyn Eadie,Tony L. Farnham,Ulrich Feindt,Anna Franckowiak,Christoffer Fremling,Avishay Gal-Yam,Suvi Gezari,Sourav Ghosh,Daniel A. Goldstein,V. Zach Golkhou,Ariel Goobar,Anna Y. Q. Ho,Daniela Huppenkothen,Zeljko Ivezic,R. Lynne Jones,Mario Juric,David L. Kaplan,Mansi M. Kasliwal,Michael S. P. Kelley,Thomas Kupfer,Chien-De Lee,Hsing Wen Lin,Ragnhild Lunnan,Ashish Mahabal,Adam A. Miller,Chow-Choong Ngeow,Peter Nugent,Eran O. Ofek,Thomas A. Prince,L. Rauch,Jan van Roestel,Steve Schulze,Leo Singer,Jesper Sollerman,Francesco Taddia,Lin Yan,Quanzhi Ye,Po-Chieh Yu,Igor Andreoni,Tom A. Barlow,James M. Bauer,Ron Beck,Justin Belicki,Rahul Biswas,V. Brinnel,Tim Brooke,Brian D. Bue,Mattia Bulla,Kevin B. Burdge,Rick Burruss,Andrew J. 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 A. Kuhn,Walter Landry,Russ R. Laher,Peter H. Mao,Frank J. Masci,Serge Monkewitz,Patrick J. Murphy,J. Nordin,Maria T. Patterson,Bryan E. Penprase,Michael Porter,Umaa Rebbapragada,Daniel J. Reiley,Reed Riddle,Mickael Rigault,Hector P. Rodriguez,Ben Rusholme,J. V. Santen,David L. Shupe,Roger M. H. 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 +116 more
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TLDR
The Zwicky Transient Facility (ZTF) as discussed by the authors is a new time domain survey employing a dedicated camera on the Palomar 48-inch Schmidt telescope with a 47 deg$^2$ field of view and 8 second readout time.Abstract:
The Zwicky Transient Facility (ZTF), a public-private enterprise, is a new time domain survey employing a dedicated camera on the Palomar 48-inch Schmidt telescope with a 47 deg$^2$ field of view and 8 second readout time. It is well positioned in the development of time domain astronomy, offering operations at 10% of the scale and style of the Large Synoptic Survey Telescope (LSST) with a single 1-m class survey telescope. The public surveys will cover the observable northern sky every three nights in g and r filters and the visible Galactic plane every night in g and r. Alerts generated by these surveys are sent in real time to brokers. A consortium of universities which provided funding ("partnership") are undertaking several boutique surveys. The combination of these surveys producing one million alerts per night allows for exploration of transient and variable astrophysical phenomena brighter than r $\sim$ 20.5 on timescales of minutes to years. We describe the primary science objectives driving ZTF including the physics of supernovae and relativistic explosions, multi-messenger astrophysics, supernova cosmology, active galactic nuclei and tidal disruption events, stellar variability, and Solar System objects.read more
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Journal ArticleDOI
Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
Maria R. Drout,Anthony L. Piro,Benjamin J. Shappee,Charles D. Kilpatrick,J. D. Simon,Carlos Contreras,David A. Coulter,R. J. Foley,Matthew R. Siebert,Nidia Morrell,Konstantina Boutsia,F. Di Mille,Thomas W.-S. Holoien,Daniel Kasen,Daniel Kasen,Juna A. Kollmeier,Barry F. Madore,Andrew J. Monson,Andrew J. Monson,Ariadna Murguia-Berthier,Yen-Chen Pan,Jason X. Prochaska,Enrico Ramirez-Ruiz,Enrico Ramirez-Ruiz,A. Rest,A. Rest,C. Adams,Katherine Alatalo,Katherine Alatalo,Eduardo Bañados,J. Baughman,J. Baughman,Timothy C. Beers,Timothy C. Beers,R. A. Bernstein,Theodoros Bitsakis,Abdo Campillay,Terese T. Hansen,C. R. Higgs,C. R. Higgs,Alexander P. Ji,Grigoris Maravelias,Jennifer L. Marshall,C. Moni Bidin,J. L. Prieto,J. L. Prieto,Kaitlin C. Rasmussen,Kaitlin C. Rasmussen,César Rojas-Bravo,A. L. Strom,N. Ulloa,J. Vargas-González,Z. Wan,Devin D. Whitten,Devin D. Whitten +54 more
TL;DR: The late-time light curve indicates that SSS17a produced at least ~0.05 solar masses of heavy elements, demonstrating that neutron star mergers play a role in rapid neutron capture (r-process) nucleosynthesis in the universe.
Journal ArticleDOI
A Radio Counterpart to a Neutron Star Merger
Gregg Hallinan,A. Corsi,Kunal Mooley,Kenta Hotokezaka,Kenta Hotokezaka,Ehud Nakar,Mansi M. Kasliwal,David L. Kaplan,Dale A. Frail,S. T. Myers,Tara Murphy,Tara Murphy,Kaushik De,Dougal Dobie,Dougal Dobie,Dougal Dobie,James R. Allison,James R. Allison,Keith W. Bannister,Varun Bhalerao,Poonam Chandra,Tracy Clarke,Simona Giacintucci,Anna Y. Q. Ho,Assaf Horesh,Namir E. Kassim,Shrinivas R. Kulkarni,Emil Lenc,Emil Lenc,Felix J. Lockman,Christene Lynch,Christene Lynch,David A. Nichols,Samaya Nissanke,Nipuni Palliyaguru,Wendy Peters,Tsvi Piran,Javed Rana,Elaine M. Sadler,Elaine M. Sadler,Leo Singer +40 more
TL;DR: Radio observations constrain the energy and geometry of relativistic material ejected from a binary neutron star merger, and the detection of a counterpart radio source that appears 16 days after the event is reported, allowing us to diagnose the energetics and environment of the merger.
Journal ArticleDOI
Candidate Electromagnetic Counterpart to the Binary Black Hole Merger Gravitational Wave Event S190521g
Matthew J. Graham,K. E. S. Ford,Barry McKernan,Nicholas P. Ross,D. Stern,Kevin B. Burdge,Michael W. Coughlin,S. G. Djorgovski,Andrew J. Drake,Dmitry A. Duev,Mansi M. Kasliwal,Ashish Mahabal,S. van Velzen,Justin Belecki,Eric C. Bellm,Rick Burruss,S. B. Cenko,Virginia Cunningham,George Helou,Shrinivas R. Kulkarni,Frank J. Masci,T. A. Prince,Daniel J. Reiley,Hector Rodriguez,B. Rusholme,Roger Smith,Maayane T. Soumagnac +26 more
TL;DR: The first plausible optical electromagnetic counterpart to a (candidate) binary black hole merger in the accretion disk of an active galactic nucleus is reported, and a repeat flare in this source due to a reencountering with the disk is predicted.
The active asteroids
TL;DR: In this paper, the authors consider 11 dynamical asteroids losing mass, in nine of which the ejected material is spatially resolved, and address mechanisms for producing mass loss including rotational instability, impact ejection, electrostatic repulsion, radiation pressure sweeping, dehydration stresses, and thermal fracture, in addition to the sublimation of ice.
The Active Centaurs
TL;DR: In this paper, the authors observed a sample of 23 Centaurs and found nine to be active, with mass-loss rates measured from several kg s−1 to several tonnes s −1.
References
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"Why Should I Trust You?": Explaining the Predictions of Any Classifier
TL;DR: In this article, the authors propose LIME, a method to explain models by presenting representative individual predictions and their explanations in a non-redundant way, framing the task as a submodular optimization problem.
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