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

作     者：van Velzen, Sjoert Gezari, Suvi Bradley Cenko, S. Kara, Erin Miller-Jones, James C.A. Hung, Tiara Bright, Joe Roth, Nathaniel Blagorodnova, Nadejda Huppenkothen, Daniela Yan, Lin Ofek, Eran Sollerman, Jesper Frederick, Sara Ward, Charlotte Graham, Matthew J. Fender, Rob Kasliwal, Mansi M. Canella, Chris Stein, Robert Giomi, Matteo Brinnel, Valery van Santen, Jakob Nordin, Jakob Bellm, Eric C. Dekany, Richard Fremling, Christoffer Zach Golkhou, V. Kupfer, Thomas Kulkarni, Shrinivas R. Laher, Russ R. Mahabal, Ashish Masci, Frank J. Miller, Adam A. Neill, James D. Riddle, Reed Rigault, Mickael Rusholme, Ben Soumagnac, Maayane T. Tachibana, Yutaro 

作者机构：Department of Astronomy University of Maryland College ParkMD20742 United States Center for Cosmology and Particle Physics New York University NY10003 United States Department of Astronomy University of Maryland College ParkMD20742 United States Joint Space-Science Institute University of Maryland College ParkMD20742 United States Astrophysics Science Division NASA Goddard Space Flight Center MC 661 GreenbeltMD20771 United States X-ray Astrophysics Laboratory NASA/Goddard Space Flight Center GreenbeltMD20771 United States ICRAR Curtin University GPO Box U1987 PerthWA6845 Australia Department of Physics University of Oxford Denys Wilkinson Building Keble Road OxfordOX1 3RH United Kingdom Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Dirac Institute Department of Astronomy University of Washington 3910 15th Avenue NE SeattleWA98195 United States Caltech Optical Observatories California Institute of Technology PasadenaCA91125 United States Benoziyo Center for Astrophysics Helen Kimmel Center for Planetary Science Weizmann Institute of Science Rehovot76100 Israel The Oskar Klein Centre & Department of Astronomy Stockholm University AlbaNova StockholmSE-106 91 Sweden Deutsches Elektronensynchrotron Platanenallee 6 ZeuthenD-15738 Germany Institute of Physics Humboldt-Universität zu Berlin Newtonstr. 15 BerlinD-12489 Germany Institute of Physics Humboldt-Universität zu Berlin Newtonstr. 15 Berlin12489 Germany Caltech Optical Observatories California Institute of Technology PasadenaCA91125 United States The eScience Institute University of Washington SeattleWA98195 United States Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106 United States Department of Physics University of California Santa BarbaraCA93106 United States Infrared Processing and Analysis Center California Institute of Technology PasadenaCA91125 United States Center for Data Driven Discovery California Institute of Technology PasadenaCA91125 United States Infrared Processing and Analysis Center California Institute of Technology MS 100-22 PasadenaCA91125 United States  Department of Physics and Astronomy Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Adler Planetarium ChicagoIL60605 United States UniversitClermont Auvergne CNRS IN2P3 Laboratoire de Physique de Clermont Clermont-FerrandF-63000 France Department of Particle Physics and Astrophysics Weizmann Institute of Science 234 Herzl St. Rehovot76100 Israel Department of Physics Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo152-8551 Japan Department of Physics Math and Astronomy California Institute of Technology PasadenaCA91125 United States 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2018年

核心收录：

主　　题：Surveys 

摘      要：We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50 days of g- and r-band detections before the time of maximum light. We also present our multi-wavelength follow-up observations, including the detection of a thermal (kT ≈ 100 eV) X-ray source that is two orders of magnitude fainter than the contemporaneous optical/UV blackbody luminosity, and a stringent upper limit to the radio emission. We use observations of 128 known active galactic nuclei (AGN) to assess the quality of the ZTF astrometry, finding a median host-flare distance of 000. 2 for genuine nuclear flares. Using ZTF observations of variability from known AGN and supernovae we show how these sources can be separated from TDEs. A combination of light-curve shape, color, and location in the host galaxy can be used to select a clean TDE sample from multi-band optical surveys such as ZTF or LSST. Copyright © 2018, The Authors. All rights reserved.