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SN 2021zny: an early flux excess combined with late-time oxygen emission suggests a double white dwarf merger event

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dc.abstract.enWe present a photometric and spectroscopic analysis of the ultraluminous and slowly evolving 03fg-like Type Ia SN 2021zny. Our observational campaign starts from ~5.3 h after explosion (making SN 2021zny one of the earliest observed members of its class), with dense multiwavelength coverage from a variety of ground- and space-based telescopes, and is concluded with a nebular spectrum ~10 months after peak brightness. SN 2021zny displayed several characteristics of its class, such as the peak brightness (M<SUB>B</SUB> = -19.95 mag), the slow decline (Δm<SUB>15</SUB>(B) = 0.62 mag), the blue early-time colours, the low ejecta velocities, and the presence of significant unburned material above the photosphere. However, a flux excess for the first ~1.5 d after explosion is observed in four photometric bands, making SN 2021zny the third 03fg-like event with this distinct behaviour, while its +313 d spectrum shows prominent [O I] lines, a very unusual characteristic of thermonuclear SNe. The early flux excess can be explained as the outcome of the interaction of the ejecta with $sim 0.04, mathrm{M_{odot }}$ of H/He-poor circumstellar material at a distance of ~10<SUP>12</SUP> cm, while the low ionization state of the late-time spectrum reveals low abundances of stable iron-peak elements. All our observations are in accordance with a progenitor system of two carbon/oxygen white dwarfs that undergo a merger event, with the disrupted white dwarf ejecting carbon-rich circumstellar material prior to the primary white dwarf detonation.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDimitriadis, Georgios
dc.contributor.authorMaguire, Kate
dc.contributor.authorKarambelkar, Viraj R.
dc.contributor.authorLebron, Ryan J.
dc.contributor.author畅), Chang Liu (刘
dc.contributor.authorKozyreva, Alexandra
dc.contributor.authorMiller, Adam A.
dc.contributor.authorRidden-Harper, Ryan
dc.contributor.authorAnderson, Joseph P.
dc.contributor.authorChen, Ting-Wan
dc.contributor.authorCoughlin, Michael
dc.contributor.authorValle, Massimo Della
dc.contributor.authorDrake, Andrew
dc.contributor.authorGalbany, Lluís
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorGroom, Steven L.
dc.contributor.authorGutiérrez, Claudia P.
dc.contributor.authorIhanec, Nada
dc.contributor.authorInserra, Cosimo
dc.contributor.authorJohansson, Joel
dc.contributor.authorMüller-Bravo, Tomás E.
dc.contributor.authorNicholl, Matt
dc.contributor.authorPolin, Abigail
dc.contributor.authorRusholme, Ben
dc.contributor.authorSchulze, Steve
dc.contributor.authorSollerman, Jesper
dc.contributor.authorSrivastav, Shubham
dc.contributor.authorTaggart, Kirsty
dc.contributor.authorWang, Qinan
dc.contributor.author轶), Yi Yang (杨
dc.contributor.authorYoung, David R.
dc.date.accessioned2024-01-26T07:51:11Z
dc.date.available2024-01-26T07:51:11Z
dc.date.copyright2023-02-16
dc.date.issued2023
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume521
dc.identifier.doi10.1093/MNRAS/STAD536
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120074
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023MNRAS.521.1162D
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages1162-1183
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleSN 2021zny: an early flux excess combined with late-time oxygen emission suggests a double white dwarf merger event
dc.typeJournalArticle
dspace.entity.typePublication