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06 October 2024 |
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Article overview
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iPTF14hls in the circumstellar medium interaction model: A promising candidate for a pulsational pair-instability supernova | | Ling-Jun Wang
; Liang-Duan Liu
; Wei-Li Lin
; Xiao-Feng Wang
; Zi-Gao Dai
; Bing Li
; Li-Ming Song
; | | Date: |
1 Jun 2022 | | Abstract: | iPTF14hls is a luminous Type II supernova (SN) with a bumpy light curve that
remains debated for its origin. It maintains roughly a constant effective
temperature and luminosity since discovery for about 600 days, followed by a
slow decay. On $sim 1000$ days post discovery the light curve transitions to
a very steep decline. A spectrum taken during this steep decline phase shows
clear signatures of shock interaction with dense circumstellar medium (CSM).
Here we explore the possibility of iPTF14hls as an interaction-powered SN. The
light curve of iPTF14hls can be fitted with wind-like CSMs. Analytic modeling
indicates that iPTF14hls may have undertaken six episodes of mass loss during
the last $sim 200mathrm{yr}$. Assuming that the 1954 eruption triggered the
last mass-loss episode, the stellar-wind velocity is determined to be
$40-70mathrm{km}mathrm{s}^{-1}$, depending on different models. Mass loss
rates are in the range $% 0.4-3.3M_{odot }mathrm{yr}^{-1}$. The inferred
total mass of ejecta and CSMs ($M_{mathrm{ej}}+M_{mathrm{CSMs}}simeq
245M_{odot }$) supports the idea that iPTF14hls may be a candidate for a
(pulsational) pair-instability SN. Discovery and observations of more similar
stellar explosions will help understand these peculiar SNe. | | Source: | arXiv, 2206.00178 | | Services: | Forum | Review | PDF | Favorites | |
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