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SN 2016dsg : a thermonuclear explosion involving a thick helium shell
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(2022) SN 2016dsg : a thermonuclear explosion involving a thick helium shell. The Astrophysical Journal, 934 (2). p. 102. doi:10.3847/1538-4357/ac75eb ISSN 1538-4357.
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Official URL: https://doi.org/10.3847/1538-4357/ac75eb
Abstract
A thermonuclear explosion triggered by a He-shell detonation on a carbon–oxygen white-dwarf core has been predicted to have strong UV line blanketing at early times due to the iron-group elements produced during He-shell burning. We present the photometric and spectroscopic observations of SN 2016dsg, a subluminous peculiar Type I supernova consistent with a thermonuclear explosion involving a thick He shell. With a redshift of 0.04, the i-band peak absolute magnitude is derived to be around −17.5. The object is located far away from its host, an early-type galaxy, suggesting it originated from an old stellar population. The spectra collected after the peak are unusually red, show strong UV line blanketing and weak O i λ7773 absorption lines, and do not evolve significantly over 30 days. An absorption line around 9700–10500 Å is detected in the near-infrared spectrum and is likely from the unburnt He in the ejecta. The spectroscopic evolution is consistent with the thermonuclear explosion models for a sub-Chandrasekhar-mass white dwarf with a thick He shell, while the photometric evolution is not well described by existing models.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
SWORD Depositor: | Library Publications Router | ||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||
Publisher: | The American Astronomical Society | ||||||
ISSN: | 1538-4357 | ||||||
Official Date: | 28 July 2022 | ||||||
Dates: |
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Volume: | 934 | ||||||
Number: | 2 | ||||||
Page Range: | p. 102 | ||||||
DOI: | 10.3847/1538-4357/ac75eb | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Reuse Statement (publisher, data, author rights): | ** From IOP Publishing via Jisc Publications Router ** History: received 22-03-2022; rev-recd 16-05-2022; accepted 31-05-2022; oa-requested 31-05-2022; epub 28-07-2022; open-access 28-07-2022; ppub 01-08-2022. ** Licence for this article: http://creativecommons.org/licenses/by/4.0/ | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 23 August 2022 | ||||||
Date of first compliant Open Access: | 23 August 2022 | ||||||
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