The spectacular evolution of Supernova 1996al over 15 yr: A low-energy explosion of a stripped massive star in a highly structured environment

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dc.contributor.authorBenetti, S.
dc.contributor.authorChugai, N.N.
dc.contributor.authorUtrobin, V.P.
dc.contributor.authorCappellaro, E.
dc.contributor.authorPatat, F.
dc.contributor.authorPastorello, A.
dc.contributor.authorTuratto, M.
dc.contributor.authorCupani, G.
dc.contributor.authorNeuhäuser, R.
dc.contributor.authorCaldwell, N.
dc.contributor.authorPignata, G.
dc.contributor.authorTomasella, L.
dc.date.accessioned2023-11-10T15:51:14Z
dc.date.available2023-11-10T15:51:14Z
dc.date.issued2016-03
dc.descriptionIndexación: Scopus.es
dc.description.abstractSpectrophotometry of SN 1996al carried out throughout 15 yr is presented. The early pho tometry suggests that SN 1996al is a linear Type II supernova, with an absolute peak of MV ∼ −18.2 mag. Early spectra present broad asymmetric Balmer emissions, with superim posed narrow lines with P-Cygni profile, and He I features with asymmetric broad emission components. The analysis of the line profiles shows that the H and He broad components form in the same region of the ejecta. By day +142, the Hα profile dramatically changes: the narrow P-Cygni profile disappears, and the Hα is fitted by three emission components that will be detected over the remaining 15 yr of the supernova (SN) monitoring campaign. Instead, the He I emissions become progressively narrower and symmetric. A sudden increase in flux of all He I lines is observed between 300 and 600 d. Models show that the SN luminosity is sustained by the interaction of low-mass (∼1.15 M ) ejecta, expelled in a low kinetic energy (∼1.6 × 1050 erg) explosion, with highly asymmetric circumstellar medium. The detection of Hα emission in pre-explosion archive images suggests that the progenitor was most likely a massive star (∼25 M ZAMS) that had lost a large fraction of its hydrogen envelope be fore explosion, and was hence embedded in a H-rich cocoon. The low-mass ejecta and modest kinetic energy of the explosion are explained with massive fallback of material into the compact remnant, a 7–8-M black hole.es
dc.description.urihttps://academic.oup.com/mnras/article/456/3/3296/1094385?login=true
dc.identifier.citationMonthly Notices of the Royal Astronomical Society. Volume 456, Issue 3, Pages 3296 - 3317. 1 March 2016es
dc.identifier.doi10.1093/mnras/stv2811
dc.identifier.issn0035-8711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/53896
dc.language.isoenes
dc.publisherOxford University Presses
dc.subjectSupernovae: Generales
dc.titleThe spectacular evolution of Supernova 1996al over 15 yr: A low-energy explosion of a stripped massive star in a highly structured environmentes
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