The Most Rapidly Declining Type i Supernova 2019bkc/ATLAS19dqr

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DOI

  • Ping Chen, Peking University
  • ,
  • Subo Dong, Peking University
  • ,
  • M. D. Stritzinger
  • Simon Holmbo
  • Jay Strader, Michigan State University
  • ,
  • C. S. Kochanek, Ohio State University
  • ,
  • Eric W. Peng, Peking University
  • ,
  • S. Benetti, Astronomical Observatory of Padua
  • ,
  • D. Bersier, Liverpool John Moores University
  • ,
  • Sasha Brownsberger, Harvard University
  • ,
  • David A.H. Buckley, South African Astronomical Observatory
  • ,
  • Mariusz Gromadzki, University of Warsaw
  • ,
  • Shane Moran, University of Turku, Nordic Optical Telescope
  • ,
  • A. Pastorello, Astronomical Observatory of Padua
  • ,
  • Elias Aydi, Michigan State University
  • ,
  • Subhash Bose, Peking University
  • ,
  • Thomas Connor, Carnegie Observatories
  • ,
  • K. Boutsia, Carnegie Institution of Washington
  • ,
  • F. D. Di Mille, Carnegie Institution of Washington
  • ,
  • N. Elias-Rosa, Autonomous University of Barcelona, Institute of Space Studies of Catalonia
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  • K. Decker French, Carnegie Observatories
  • ,
  • Thomas W.S. Holoien, Carnegie Observatories
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  • Seppo Mattila, University of Turku
  • ,
  • B. J. Shappee, University of Hawaii at Manoa
  • ,
  • Antony A. Stark, Harvard-Smithsonian Center for Astrophysics
  • ,
  • Samuel J. Swihart, Michigan State University

We report observations of the hydrogen-deficient supernova (SN) 2019bkc/ATLAS19dqr. With B- A nd r-band decline between peak and 10 days post peak of ALT="${\rm{\Delta }}{m} {10}(B)=5.24\pm 0.07$" SRC="apjlab62a4ieqn1.gif"/ mag and ALT="${\rm{\Delta }}{m} {10}(r)=3.85\pm 0.10$" SRC="apjlab62a4ieqn2.gif"/ mag, respectively, SN 2019bkc is the most rapidly declining SN I discovered so far. While its closest matches are the rapidly declining SN 2005ek and SN 2010X, the light curves and spectra of SN 2019bkc show some unprecedented characteristics. SN 2019bkc appears "hostless," with no identifiable host galaxy near its location, although it may be associated with the galaxy cluster MKW1 at z = 0.02. We evaluate a number of existing models of fast-evolving SNe, and we find that none of them can satisfactorily explain all aspects of SN 2019bkc observations.

Original languageEnglish
Article numberL6
JournalAstrophysical Journal Letters
Volume889
Issue1
Number of pages17
ISSN2041-8205
DOIs
Publication statusPublished - 20 Jan 2020

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