Artículo
Fast and not-so-furious: case study of the fast and faint Type IIb SN 2021bxu
Desai, Dhvanil D.; Ashall, Chris; Shappee, Benjamin J.; Morrell, Nidia Irene
; Galbany, Lluís; Burns, Christopher R.; Derkacy, James M.; Hinkle, Jason T.; Hsiao, Eric; Kumar, Sahana; Lu, Jing; Phillips, Mark; Shahbandeh, Melissa; Stritzinger, Maximilian; Baron, Eddie; Bersten, Melina Cecilia
; Brown, Peter J.; De Jaeger, Thomas; Elias Rosa, Nancy; Folatelli, Gaston
; Huber, Mark E.; Mazzali, Paolo; Müller Bravo, Tomás E.; Piro, Anthony; Polin, Abigail; Suntzeff, Nicholas B.; Anderson, Joseph; Chambers, Kenneth C.; Chen, Ting Wan; De Boer, Thomas; Fulton, Michael D.; Gao, Hua; Gromadzki, Mariusz; Inserra, Cosimo; Magnier, Eugene A.; Nicholl, Matt; Ragosta, Fabio; Wainscoat, Richard; Young, David R.
Fecha de publicación:
09/2023
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present photometric and spectroscopic observations and analysis of SN 2021bxu (ATLAS21dov), a low-luminosity, fast-evolving Type IIb supernova (SN). SN 2021bxu is unique, showing a large initial decline in brightness followed by a short plateau phase. With during the plateau, it is at the lower end of the luminosity distribution of stripped-envelope supernovae (SE-SNe) and shows a distinct ∼10 d plateau not caused by H- or He-recombination. SN 2021bxu shows line velocities which are at least slower than typical SE-SNe. It is photometrically and spectroscopically similar to Type IIb SNe during the photospheric phases of evolution, with similarities to Ca-rich IIb SNe. We find that the bolometric light curve is best described by a composite model of shock interaction between the ejecta and an envelope of extended material, combined with a typical SN IIb powered by the radioactive decay of 56Ni. The best-fitting parameters for SN 2021bxu include a 56Ni mass of, an ejecta mass of, and an ejecta kinetic energy of. From the fits to the properties of the extended material of Ca-rich IIb SNe we find a trend of decreasing envelope radius with increasing envelope mass. SN 2021bxu has MNi on the low end compared to SE-SNe and Ca-rich SNe in the literature, demonstrating that SN 2021bxu-like events are rare explosions in extreme areas of parameter space. The progenitor of SN 2021bxu is likely a low-mass He star with an extended envelope.
Palabras clave:
STARS: MASSIVE
,
SUPERNOVAE: GENERAL
,
SUPERNOVAE: INDIVIDUAL: SN 2021BXU
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Identificadores
Colecciones
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Desai, Dhvanil D.; Ashall, Chris; Shappee, Benjamin J.; Morrell, Nidia Irene; Galbany, Lluís; et al.; Fast and not-so-furious: case study of the fast and faint Type IIb SN 2021bxu; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 524; 1; 9-2023; 767-785
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