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SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

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dc.abstract.enWe present SN2018kzr, the fastest declining supernova-like transient, second only to the kilonova, AT2017gfo. SN2018kzr is characterized by a peak magnitude of M <SUB> r </SUB> = -17.98, a peak bolometric luminosity of ˜1.4 × 10<SUP>43</SUP> erg s<SUP>-1</SUP>, and a rapid decline rate of 0.48 ± 0.03 mag day<SUP>-1</SUP> in the r band. The bolometric luminosity evolves too quickly to be explained by pure <SUP>56</SUP>Ni heating, necessitating the inclusion of an alternative powering source. Incorporating the spin-down of a magnetized neutron star adequately describes the lightcurve and we estimate a small ejecta mass of M <SUB>ej</SUB> = 0.10 ± 0.05 M <SUB>⊙</SUB>. Our spectral modeling suggests the ejecta is composed of intermediate mass elements including O, Si, and Mg and trace amounts of Fe-peak elements, which disfavors a binary neutron star merger. We discuss three explosion scenarios for SN2018kzr, given the low ejecta mass, intermediate mass element composition, and high likelihood of additional powering—the core collapse of an ultra-stripped progenitor, the accretion induced collapse (AIC) of a white dwarf, and the merger of a white dwarf and neutron star. The requirement for an alternative input energy source favors either the AIC with magnetar powering or a white dwarf-neutron star merger with energy from disk wind shocks.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMcBrien, Owen R.
dc.contributor.authorSmartt, Stephen J.
dc.contributor.authorChen, Ting-Wan
dc.contributor.authorInserra, Cosimo
dc.contributor.authorGillanders, James H.
dc.contributor.authorSim, Stuart A.
dc.contributor.authorJerkstrand, Anders
dc.contributor.authorRest, Armin
dc.contributor.authorValenti, Stefano
dc.contributor.authorRoy, Rupak
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorTaubenberger, Stefan
dc.contributor.authorFlörs, Andreas
dc.contributor.authorHuber, Mark E.
dc.contributor.authorChambers, Ken C.
dc.contributor.authorGal-Yam, Avishay
dc.contributor.authorYoung, David R.
dc.contributor.authorNicholl, Matt
dc.contributor.authorKankare, Erkki
dc.contributor.authorSmith, Ken W.
dc.contributor.authorMaguire, Kate
dc.contributor.authorMandel, Ilya
dc.contributor.authorPrentice, Simon
dc.contributor.authorRodríguez, Ósmar
dc.contributor.authorGarcia, Jonathan Pineda
dc.contributor.authorGutiérrez, Claudia P.
dc.contributor.authorGalbany, Lluís
dc.contributor.authorBarbarino, Cristina
dc.contributor.authorClark, Peter S. J.
dc.contributor.authorSollerman, Jesper
dc.contributor.authorKulkarni, Shrinivas R.
dc.contributor.authorDe, Kishalay
dc.contributor.authorBuckley, David A. H.
dc.contributor.authorRau, Arne
dc.date.accessioned2024-01-26T07:49:53Z
dc.date.available2024-01-26T07:49:53Z
dc.date.copyright2019-09-10
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume885
dc.identifier.doi10.3847/2041-8213/AB4DAE
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120054
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...885L..23M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL23
dc.rightsOther
dc.sciencecloudnosend
dc.titleSN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf
dc.typeJournalArticle
dspace.entity.typePublication