The Most Rapidly Declining Type I Supernova 2019bkc/ATLAS19dqr

Journal
Date Issued
2020
Author(s)
Chen, Ping
•
Dong, Subo
•
Stritzinger, M. D.
•
Holmbo, Simon
•
Strader, Jay
•
Kochanek, C. S.
•
Peng, Eric W.
•
•
Bersier, D.
•
Brownsberger, Sasha
•
Buckley, David A. H.
•
Gromadzki, Mariusz
•
Moran, Shane
•
•
Aydi, Elias
•
Bose, Subhash
•
Connor, Thomas
•
Boutsia, K.
•
Di Mille, F.
•
•
French, K. Decker
•
Holoien, Thomas W. -S.
•
Mattila, Seppo
•
Shappee, B. J.
•
Stark, Antony A.
•
Swihart, Samuel J.
DOI
Abstract
We report observations of the hydrogen-deficient supernova (SN) 2019bkc/ATLAS19dqr. With B- and r-band decline between peak and 10 days post peak of ${\rm{\Delta }}{m}_{10}(B)=5.24\pm 0.07$ mag and ${\rm{\Delta }}{m}_{10}(r)=3.85\pm 0.10$ 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.
Volume
889
Issue
1
Start page
L6
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2020ApJ...889L...6C
Rights
open.access
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