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SN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell

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cris.lastimport.scopus2024-02-12T19:33:44Z
dc.abstract.enA 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorValenti, Stefano
dc.contributor.authorDong, Yize
dc.contributor.authorPolin, Abigail
dc.contributor.authorBoyle, Aoife
dc.contributor.authorJencson, Jacob E.
dc.contributor.authorSrivastav, Shubham
dc.contributor.authorTerwel, J. H.
dc.contributor.authorBenetti, Stefano
dc.contributor.authorWyatt, Samuel
dc.contributor.authorFlörs, Andreas
dc.contributor.authorYoung, D. R.
dc.contributor.authorHowell, D. Andrew
dc.contributor.authorMaguire, Kate
dc.contributor.authorVogl, Christian
dc.contributor.authorTaubenberger, Stefan
dc.contributor.authorKerzendorf, Wolfgang E.
dc.contributor.authorSand, David J.
dc.contributor.authorJha, Saurabh W.
dc.contributor.authorAndrews, Jennifer E.
dc.contributor.authorLyman, J. D.
dc.contributor.authorBostroem, K. Azalee
dc.contributor.authorBlondin, Stéphane
dc.contributor.authorLundquist, Michael
dc.contributor.authorInserra, Cosimo
dc.contributor.authorMagee, Mark
dc.contributor.authorMeza, Nicolas
dc.contributor.authorMcCully, Curtis
dc.contributor.authorGalbany, L.
dc.contributor.authorHosseinzadeh, Griffin
dc.contributor.authorPearson, Jeniveve
dc.contributor.authorGromadzki, Mariusz
dc.date.accessioned2024-01-26T07:49:58Z
dc.date.available2024-01-26T07:49:58Z
dc.date.copyright2022-07-28
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionFINAL_PUBLISHED
dc.description.volume934
dc.identifier.doi10.3847/1538-4357/AC75EB
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120058
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022ApJ...934..102D
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages102
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleSN 2016dsg: A Thermonuclear Explosion Involving a Thick Helium Shell
dc.typeJournalArticle
dspace.entity.typePublication