LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation

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dc.contributor.authorPolshaw, J.
dc.contributor.authorKotak, R.
dc.contributor.authorDessart, L.
dc.contributor.authorFraser, M.
dc.contributor.authorGal-Yam, A.
dc.contributor.authorInserra, C.
dc.contributor.authorSim, S. A.
dc.contributor.authorSmartt, S. J.
dc.contributor.authorSollerman, J.
dc.contributor.authorBaltay, C.
dc.contributor.authorRabinowitz, D.
dc.contributor.authorBenetti, S.
dc.contributor.authorBotticella, M. T.
dc.contributor.authorCampbell, H.
dc.contributor.authorChen, T.-W.
dc.contributor.authorGalbany, L.
dc.contributor.authorMcKinnon, R.
dc.contributor.authorNicholl, M.
dc.contributor.authorSmith, K. W.
dc.contributor.authorSullivan, M.
dc.contributor.authorTakáts, K.
dc.contributor.authorValenti, S.
dc.contributor.authorYoung, D. R.
dc.date.accessioned2017-08-18T20:48:33Z
dc.date.available2017-08-18T20:48:33Z
dc.date.issued2016-04
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractWe present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z⊙. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.es_CL
dc.description.urihttps://www.aanda.org/articles/aa/abs/2016/04/aa27682-15/aa27682-15.html
dc.identifier.citationAstronomy and Astrophysics. Volume 588, 1 April 2016, Article number A1es_CL
dc.identifier.issn0004-6361
dc.identifier.otherhttps://doi.org/10.1051/0004-6361/201527682
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/3982
dc.language.isoenes_CL
dc.publisherEDP SCIENCESes_CL
dc.subjectSupernovae: generales_CL
dc.subjectSupernovae: individual: LSQ13fnes_CL
dc.titleLSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relationes_CL
dc.typeArtículoes_CL
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