The Most Rapidly Declining Type I Supernova 2019bkc/ATLAS19dqr

Subhash Bose; Seppo Mattila; David A. H. Buckley; Subo Dong; Simon Holmbo; Shane Moran; K. Decker French; Eric W. Peng; Antony A. Stark; B. J. Shappee; Ping Chen; Sasha Brownsberger; K. Boutsia; A. Pastorello; C. S. Kochanek; D. Bersier; N. Elias-Rosa; Elias Aydi; F. Di Mille; Thomas Connor; M. D. Stritzinger; S. Benetti; Thomas W.-S. Holoien; Samuel J. Swihart; Mariusz Gromadzki; Jay Strader
The Most Rapidly Declining Type I Supernova 2019bkc/ATLAS19dqr

Subhash Bose
Seppo Mattila
David A. H. Buckley
Subo Dong
Simon Holmbo
Shane Moran
K. Decker French
Eric W. Peng
Antony A. Stark
B. J. Shappee
Ping Chen
Sasha Brownsberger
K. Boutsia
A. Pastorello
C. S. Kochanek
D. Bersier
N. Elias-Rosa
Elias Aydi
F. Di Mille
Thomas Connor
M. D. Stritzinger
S. Benetti
Thomas W.-S. Holoien
Samuel J. Swihart
Mariusz Gromadzki
Jay Strader
Katso/Avaa
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IOP PUBLISHING LTD
doi:10.3847/2041-8213/ab62a4
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042821998
Tiivistelmä
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 Dm10 (B) = 5.24. 0.07 mag and Dm10 (r) = 3.85. 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.
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