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SN 2021zny :
SN 2021zny : an early flux excess combined with late-time oxygen emission suggests a double white dwarf merger event
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Dimitriadis, Georgios (author)
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Maguire, Kate (author)
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Karambelkar, Viraj R. (author)
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Lebron, Ryan J. (author)
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Liu, Chang (author)
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Kozyreva, Alexandra (author)
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Miller, Adam A. (author)
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Ridden-Harper, Ryan (author)
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Anderson, Joseph P. (author)
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Chen, Ting-Wan (author)
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Coughlin, Michael (author)
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Valle, Massimo Della (author)
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Drake, Andrew (author)
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Galbany, Lluis (author)
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Gromadzki, Mariusz (author)
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Groom, Steven L. (author)
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Gutierrez, Claudia P. (author)
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Ihanec, Nada (author)
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Inserra, Cosimo (author)
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- Pearson Johansson, Joel, 1984- (author)
- Stockholms universitet,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Mueller-Bravo, Tomas E. (author)
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Nicholl, Matt (author)
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Polin, Abigail (author)
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Rusholme, Ben (author)
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Schulze, Steve (author)
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- Sollerman, Jesper, 1968- (author)
- Stockholms universitet,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Srivastav, Shubham (author)
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Taggart, Kirsty (author)
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Wang, Qinan (author)
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Yang, Yi (author)
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Young, David R. (author)
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(creator_code:org_t)
- 2023-02-27
- 2023
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 521:1, s. 1162-1183
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present a photometric and spectroscopic analysis of the ultraluminous and slowly evolving 03fg-like Type Ia SN 2021zny. Our observational campaign starts from similar to 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 similar to 10 months after peak brightness. SN 2021zny displayed several characteristics of its class, such as the peak brightness (M-B = -19.95 mag), the slow decline (delta m(15)(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 fluxexcess for the first similar to 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 [OI] 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 similar to 0 . 04 M-? of H/He-poor circumstellar material at a distance of similar to 10(12) cm, while the low ionization state of the late-time spectrum re veals lo w 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- transients
- supernovae - supernovae
- individual
- 2021zny
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Dimitriadis, Geo ...
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Maguire, Kate
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Karambelkar, Vir ...
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Lebron, Ryan J.
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Liu, Chang
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Kozyreva, Alexan ...
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show more...
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Miller, Adam A.
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Ridden-Harper, R ...
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Anderson, Joseph ...
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Chen, Ting-Wan
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Coughlin, Michae ...
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Valle, Massimo D ...
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Drake, Andrew
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Galbany, Lluis
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Gromadzki, Mariu ...
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Groom, Steven L.
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Gutierrez, Claud ...
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Ihanec, Nada
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Inserra, Cosimo
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Pearson Johansso ...
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Mueller-Bravo, T ...
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Nicholl, Matt
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Polin, Abigail
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Rusholme, Ben
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Schulze, Steve
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Sollerman, Jespe ...
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Srivastav, Shubh ...
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Taggart, Kirsty
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Wang, Qinan
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Yang, Yi
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Young, David R.
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show less...
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Stockholm University