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The low-luminosity Type II SN 2016aqf: a well-monitored spectral evolution of the Ni/Fe abundance ratio

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dc.abstract.enLow-luminosity Type II supernovae (LL SNe II) make up the low explosion energy end of core-collapse SNe, but their study and physical understanding remain limited. We present SN 2016aqf, an LL SN II with extensive spectral and photometric coverage. We measure a V-band peak magnitude of -14.58 mag, a plateau duration of ˜100 d, and an inferred <SUP>56</SUP>Ni mass of 0.008 ± 0.002 M<SUB>⊙</SUB>. The peak bolometric luminosity, L<SUB>bol</SUB> ≍ 10<SUP>41.4</SUP> erg s<SUP>-1</SUP>, and its spectral evolution are typical of other SNe in the class. Using our late-time spectra, we measure the [O I] λλ6300, 6364 lines, which we compare against SN II spectral synthesis models to constrain the progenitor zero-age main-sequence mass. We find this to be 12 ± 3 M<SUB>⊙</SUB>. Our extensive late-time spectral coverage of the [Fe II] λ7155 and [Ni II] λ7378 lines permits a measurement of the Ni/Fe abundance ratio, a parameter sensitive to the inner progenitor structure and explosion mechanism dynamics. We measure a constant abundance ratio evolution of $0.081^{+0.009}_{-0.010}$ and argue that the best epochs to measure the ratio are at ˜200-300 d after explosion. We place this measurement in the context of a large sample of SNe II and compare against various physical, light-curve, and spectral parameters, in search of trends that might allow indirect ways of constraining this ratio. We do not find correlations predicted by theoretical models; however, this may be the result of the exact choice of parameters and explosion mechanism in the models, the simplicity of them, and/or primordial contamination in the measured abundance ratio.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMüller-Bravo, Tomás E.
dc.contributor.authorGutiérrez, Claudia P.
dc.contributor.authorSullivan, Mark
dc.contributor.authorJerkstrand, Anders
dc.contributor.authorAnderson, Joseph P.
dc.contributor.authorGonzález-Gaitán, Santiago
dc.contributor.authorSollerman, Jesper
dc.contributor.authorArcavi, Iair
dc.contributor.authorBurke, Jamison
dc.contributor.authorGalbany, Lluís
dc.contributor.authorGal-Yam, Avishay
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorHiramatsu, Daichi
dc.contributor.authorHosseinzadeh, Griffin
dc.contributor.authorHowell, D. Andrew
dc.contributor.authorInserra, Cosimo
dc.contributor.authorKankare, Erki
dc.contributor.authorKozyreva, Alexandra
dc.contributor.authorMcCully, Curtis
dc.contributor.authorNicholl, Matt
dc.contributor.authorSmartt, Stephen
dc.contributor.authorValenti, Stefano
dc.contributor.authorYoung, Dave R.
dc.date.accessioned2024-01-26T10:27:30Z
dc.date.available2024-01-26T10:27:30Z
dc.date.copyright2020-06-26
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume497
dc.identifier.doi10.1093/MNRAS/STAA1932
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/122652
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020MNRAS.497..361M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages361-377
dc.rightsOther
dc.sciencecloudnosend
dc.titleThe low-luminosity Type II SN 2016aqf: a well-monitored spectral evolution of the Ni/Fe abundance ratio
dc.typeJournalArticle
dspace.entity.typePublication