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Fast and not-so-furious: Case study of the fast and faint Type IIb SN 2021bxu

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dc.abstract.enWe 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 $M_r = -15.93 pm 0.16, mathrm{mag}$ 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 $sim 1500, mathrm{km, s^{-1}}$ 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 <SUP>56</SUP>Ni. The best-fitting parameters for SN 2021bxu include a <SUP>56</SUP>Ni mass of $M_{mathrm{Ni}} = 0.029^{+0.004}_{-0.005}, mathrm{{ m M}_{odot }}$, an ejecta mass of $M_{mathrm{ej}} = 0.61^{+0.06}_{-0.05}, mathrm{{ m M}_{odot }}$, and an ejecta kinetic energy of $K_{mathrm{ej}} = 8.8^{+1.1}_{-1.0} imes 10^{49}, mathrm{erg}$. 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 M<SUB>Ni</SUB> 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDesai, Dhvanil D.
dc.contributor.authorAshall, Chris
dc.contributor.authorShappee, Benjamin J.
dc.contributor.authorMorrell, Nidia
dc.contributor.authorGalbany, Lluís
dc.contributor.authorBurns, Christopher R.
dc.contributor.authorDerKacy, James M.
dc.contributor.authorHinkle, Jason T.
dc.contributor.authorHsiao, Eric
dc.contributor.authorKumar, Sahana
dc.contributor.authorLu, Jing
dc.contributor.authorPhillips, Mark M.
dc.contributor.authorShahbandeh, Melissa
dc.contributor.authorStritzinger, Maximilian D.
dc.contributor.authorBaron, Eddie
dc.contributor.authorBersten, Melina C.
dc.contributor.authorBrown, Peter J.
dc.contributor.authorJaeger, Thomas de
dc.contributor.authorElias-Rosa, Nancy
dc.contributor.authorFolatelli, Gastón
dc.contributor.authorHuber, Mark E.
dc.contributor.authorMazzali, Paolo
dc.contributor.authorMüller-Bravo, Tomás E.
dc.contributor.authorPiro, Anthony L.
dc.contributor.authorPolin, Abigail
dc.contributor.authorSuntzeff, Nicholas B.
dc.contributor.authorAnderson, Joseph P.
dc.contributor.authorChambers, Kenneth C.
dc.contributor.authorChen, Ting-Wan
dc.contributor.authorBoer, Thomas de
dc.contributor.authorFulton, Michael D.
dc.contributor.authorGao, Hua
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorInserra, Cosimo
dc.contributor.authorMagnier, Eugene A.
dc.contributor.authorNicholl, Matt
dc.contributor.authorRagosta, Fabio
dc.contributor.authorWainscoat, Richard
dc.contributor.authorYoung, David R.
dc.date.accessioned2024-01-25T00:16:40Z
dc.date.available2024-01-25T00:16:40Z
dc.date.copyright2023-03-23
dc.date.issued2023
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume524
dc.identifier.doi10.1093/MNRAS/STAD1932
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106996
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023MNRAS.524..767D
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages767-785
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleFast and not-so-furious: Case study of the fast and faint Type IIb SN 2021bxu
dc.typeJournalArticle
dspace.entity.typePublication