Details

Autor(en) / Beteiligte

• Graur, O
• Padilla Gonzalez, E
• Burke, J
• Deckers, M
• Jha, S W
• Galbany, L
• Karamehmetoglu, E
• Stritzinger, M D
• Maguire, K
• Howell, D A
• Fisher, R
• Fullard, A G
• Handberg, R
• Hiramatsu, D
• Hosseinzadeh, G
• Kerzendorf, W E
• McCully, C
• Newsome, M
• Pellegrino, C
• Rest, A
• Riess, A G
• Seitenzahl, I R
• Shara, M M
• Shen, K J
• Terreran, G
• Zurek, D R

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2023-09, Vol.526 (2), p.2977-2990

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2023

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• ABSTRACT 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.