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SN 2017czd: A Rapidly Evolving Supernova from a Weak Explosion of a Type IIb Supernova Progenitor
- Publication Year :
- 2019
-
Abstract
- We present optical and near-infrared observations of the rapidly evolving supernova (SN) 2017czd that shows hydrogen features. The optical light curves exhibit a short plateau phase ($\sim 13$ days in the $R$-band) followed by a rapid decline by $4.5$ mag in $\sim 20 \mathrm{days}$ after the plateau. The decline rate is larger than those of any standard SNe, and close to those of rapidly evolving transients. The peak absolute magnitude is $-16.8$ mag in the $V$-band, which is within the observed range for SNe IIP and rapidly evolving transients. The spectra of SN 2017czd clearly show the hydrogen features and resemble those of SNe IIP at first. The H$\alpha$ line, however, does not evolve much with time and it becomes similar to those in SNe IIb at decline phase. We calculate the synthetic light curves using a SN IIb progenitor which has 16 M$_{\odot}$ at the zero-age main sequence and evolves in a binary system. The model with a low explosion energy ($5\times 10^{50}$ erg) and a low ${}^{56}$Ni mass ($0.003 \mathrm{M}_{\odot}$) can reproduce the short plateau phase as well as the sudden drop of the light curve as observed in SN 2017czd. We conclude that SN 2017czd might be the first identified weak explosion from a SN IIb progenitor. We suggest that some rapidly evolving transients can be explained by such a weak explosion of the progenitors with little hydrogen-rich envelope.<br />Comment: 11 pages, 15 figures. Accepted for publication in ApJ
- Subjects :
- Absolute magnitude
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
010504 meteorology & atmospheric sciences
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Plateau (mathematics)
Light curve
01 natural sciences
Spectral line
Supernova
Space and Planetary Science
0103 physical sciences
Binary system
Astrophysics - High Energy Astrophysical Phenomena
010303 astronomy & astrophysics
Energy (signal processing)
0105 earth and related environmental sciences
Line (formation)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....e1f203d927331bbb9f02ce4fd363dc99