No plateau observed in late-time near-infrared observations of the underluminous Type Ia supernova 2021qvv

Near-infrared (NIR) observations of normal Type Ia supernovae (SNe Ia) obtained between 150 and 500 d past maximum light reveal the existence of an extended plateau. Here, we present observations of the underluminous, 1991bg-like SN 2021qvv. Early, ground-based optical and NIR observations show that...

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Detalhes bibliográficos
Autores: Graur, Or, Padilla González, E., Burke, Jamison, Deckers, Maxime, Jha, Saurabh W., Galbany, Lluís, Stritzinger, Maximilian, Maguire, Kate, Howell, D. Andrew, Fisher, Robert, Fullard, Andrew, Handberg, Rasmus, Hiramatsu, Daichi, Hosseinzadeh, Griffin, Kerzendorf, Wolfgang, McCully, Curtis, Newsome, Megan, Pellegrino, Craig, Rest, Armin, Riess, Adam, Seitenzahl, I. R., Shara, Michael, Shen, Ken J., Terreran, Giacomo, Zurek, D. R.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/348311
Acesso em linha:http://hdl.handle.net/10261/348311
Access Level:Acceso aberto
Palavra-chave:Methods: observational
Supernovae: general
Supernovae: individual: SN2021qvv
White dwarfs
Descrição
Resumo:Near-infrared (NIR) observations of normal Type Ia supernovae (SNe Ia) obtained between 150 and 500 d past maximum light reveal the existence of an extended plateau. Here, we present observations of the underluminous, 1991bg-like SN 2021qvv. Early, ground-based optical and NIR observations show that SN 2021qvv is similar to SN 2006mr, making it one of the dimmest, fastest evolving 1991bg-like SNe to date. Late-time (170–250 d) Hubble Space Telescope observations of SN 2021qvv reveal no sign of a plateau. An extrapolation of these observations backwards to earlier-phase NIR observations of SN 2006mr suggests the complete absence of an NIR plateau, at least out to 250 d. This absence may be due to a higher ionization state of the ejecta, as predicted by certain sub-Chandrasekhar-mass detonation models, or to the lower temperatures of the ejecta of 1991bg-like SNe, relative to normal SNe Ia, which might preclude their becoming fluorescent and shifting ultraviolet light into the NIR. This suggestion can be tested by acquiring NIR imaging of a sample of 1991bg-like SNe that covers the entire range from slowly evolving to fast-evolving events (0.2 ≲ sBV ≲ 0.6). A detection of the NIR plateau in slower evolving, hotter 1991bg-like SNe would provide further evidence that these SNe exist along a continuum with normal SNe Ia. Theoretical progenitor and explosion scenarios would then have to match the observed properties of both SN Ia subtypes.

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