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SN 2020acat: an energetic fast rising Type IIb supernova

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dc.abstract.enThe ultraviolet (UV) and near-infrared (NIR) photometric and optical spectroscopic observations of SN 2020acat covering ~250 d after explosion are presented here. Using the fast rising photometric observations, spanning from the UV to NIR wavelengths, a pseudo-bolometric light curve was constructed and compared to several other well-observed Type IIb supernovae (SNe IIb). SN 2020acat displayed a very short rise time reaching a peak luminosity of $mathrm{{ m Log}_{10}}(L) = 42.49 pm 0.17 , mathrm{erg , s^{-1}}$ in only ~14.6 ± 0.3 d. From modelling of the pseudo-bolometric light curve, we estimated a total mass of <SUP>56</SUP>Ni synthesized by SN 2020acat of M<SUB>Ni</SUB> = 0.13 ± 0.03 M<SUB>⊙</SUB>, with an ejecta mass of M<SUB>ej</SUB> = 2.3 ± 0.4 M<SUB>⊙</SUB> and a kinetic energy of E<SUB>k</SUB> = 1.2 ± 0.3 × 10<SUP>51</SUP> erg. The optical spectra of SN 2020acat display hydrogen signatures well into the transitional period (≳ 100 d), between the photospheric and the nebular phases. The spectra also display a strong feature around 4900 Å that cannot be solely accounted for by the presence of the Fe II 5018 line. We suggest that the Fe II feature was augmented by He I 5016 and possibly by the presence of N II 5005. From both photometric and spectroscopic analysis, we inferred that the progenitor of SN 2020acat was an intermediate-mass compact star with an M<SUB>ZAMS</SUB> of 15-20 M<SUB>⊙</SUB>.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorYoung, D. R.
dc.contributor.authorElias-Rosa, N.
dc.contributor.authorBostroem, K. A.
dc.contributor.authorInserra, C.
dc.contributor.authorLundqvist, P.
dc.contributor.authorBurke, J.
dc.contributor.authorCai, Y. -Z.
dc.contributor.authorMcCully, C.
dc.contributor.authorNicholl, M.
dc.contributor.authorHiramatsu, D.
dc.contributor.authorPastorello, A.
dc.contributor.authorGalbany, L.
dc.contributor.authorBenetti, S.
dc.contributor.authorPellegrino, C.
dc.contributor.authorRoy, R.
dc.contributor.authorArcavi, I.
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorParaskeva, E.
dc.contributor.authorNewsome, M.
dc.contributor.authorCharalampopoulos, P.
dc.contributor.authorPessi, P. J.
dc.contributor.authorAnderson, J. P.
dc.contributor.authorReynolds, T. M.
dc.contributor.authorMüller-Bravo, T.
dc.contributor.authorHowell, D. A.
dc.contributor.authorReguitti, A.
dc.contributor.authorTomasella, L.
dc.contributor.authorTeffs, J.
dc.contributor.authorMedler, K.
dc.contributor.authorMazzali, P. A.
dc.contributor.authorTerreran, G.
dc.contributor.authorErgon, M.
dc.contributor.authorAshall, C.
dc.contributor.authorGonzalez, E. Padilla
dc.date.accessioned2024-01-26T07:51:00Z
dc.date.available2024-01-26T07:51:00Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.number4
dc.description.volume513
dc.identifier.doi10.1093/MNRAS/STAC1192
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120071
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022MNRAS.513.5540M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages5540-5558
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleSN 2020acat: an energetic fast rising Type IIb supernova
dc.typeJournalArticle
dspace.entity.typePublication