TY - JOUR
T1 - Fast and not-so-furious
T2 - Case study of the fast and faint Type IIb SN 2021bxu
AU - Desai, Dhvanil D.
AU - Ashall, Chris
AU - Shappee, Benjamin J.
AU - Morrell, Nidia
AU - Galbany, Lluís
AU - Burns, Christopher R.
AU - Derkacy, James M.
AU - Hinkle, Jason T.
AU - Hsiao, Eric
AU - Kumar, Sahana
AU - Lu, Jing
AU - Phillips, Mark M.
AU - Shahbandeh, Melissa
AU - Stritzinger, Maximilian D.
AU - Baron, Eddie
AU - Bersten, Melina C.
AU - Brown, Peter J.
AU - De Jaeger, Thomas
AU - Elias-Rosa, Nancy
AU - Folatelli, Gastón
AU - Huber, Mark E.
AU - Mazzali, Paolo
AU - Müller-Bravo, Tomás E.
AU - Piro, Anthony L.
AU - Polin, Abigail
AU - Suntzeff, Nicholas B.
AU - Anderson, Joseph P.
AU - Chambers, Kenneth C.
AU - Chen, Ting Wan
AU - De Boer, Thomas
AU - Fulton, Michael D.
AU - Gao, Hua
AU - Gromadzki, Mariusz
AU - Inserra, Cosimo
AU - Magnier, Eugene A.
AU - Nicholl, Matt
AU - Ragosta, Fabio
AU - Wainscoat, Richard
AU - Young, David R.
N1 - Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - 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.
AB - 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.
KW - stars: massive
KW - supernovae: general
KW - supernovae: individual: SN 2021bxu
UR - http://www.scopus.com/inward/record.url?scp=85166043253&partnerID=8YFLogxK
U2 - 10.1093/mnras/stad1932
DO - 10.1093/mnras/stad1932
M3 - 期刊論文
AN - SCOPUS:85166043253
SN - 0035-8711
VL - 524
SP - 767
EP - 785
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -