Multi-wavelength observations of supernova 2011ei: time-dependent classification of type iib and ib supernovae and implications for their progenitors

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dc.contributor.authorMilisavljevic, Dan
dc.contributor.authorMargutti, Raffaella
dc.contributor.authorSoderberg, Alicia M.
dc.contributor.authorPignata, Giuliano
dc.contributor.authorChomiuk, Laura
dc.contributor.authorFesen, Robert A.
dc.contributor.authorBufano, Filomena
dc.contributor.authorSanders, Nathan E.
dc.contributor.authorParrent, Jerod T.
dc.contributor.authorParker, Stuart
dc.contributor.authorPickering, Timothy
dc.contributor.authorBuckley, David A. H.
dc.contributor.authorCrawford, Steven M.
dc.contributor.authorGulbis, Amanda A. S.
dc.contributor.authorHettlage, Christian
dc.contributor.authorHooper, Eric
dc.contributor.authorNordsieck, Kenneth H.
dc.contributor.authorO'Donoghue, Darragh
dc.contributor.authorHusser, Tim-Oliver
dc.contributor.authorPotter, Stephen
dc.contributor.authorKniazev, Alexei
dc.contributor.authorKotze, Paul
dc.contributor.authorRomero-Colmenero, Encarni
dc.contributor.authorVaisanen, Petri
dc.contributor.authorWolf, Marsha
dc.contributor.authorBartel, Norbert
dc.contributor.authorBietenholz, Michael F.
dc.contributor.authorFransson, Claes
dc.contributor.authorMazzali, Paolo
dc.contributor.authorBrunthaler, Andreas
dc.contributor.authorChakraborti, Sayan
dc.contributor.authorLevesque, Emily M.
dc.contributor.authorMacFayden, Andrew
dc.contributor.authorDrescher, Colin
dc.contributor.authorBock, Greg
dc.contributor.authorMarples, Peter
dc.contributor.authorAnderson, Joseph P.
dc.contributor.authorBenetti, Stefano
dc.contributor.authorReichart, Daniel
dc.contributor.authorIvarsen, Kevin
dc.date.accessioned2013-10-22T18:50:36Z
dc.date.accessioned2016-05-24T20:17:54Z
dc.date.available2013-10-22T18:50:36Z
dc.date.available2016-05-24T20:17:54Z
dc.date.issued2012
dc.description.abstractWe present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN) 2011ei, one of the least luminous SNe IIb or Ib observed to date. Our observations begin with a discovery within 1 day of explosion and span several months afterward. Early optical spectra exhibit broad, Type II-like hydrogen Balmer profiles that subside rapidly and are replaced by Type Ib-like He-rich features on the timescale of one week. High-cadence monitoring of this transition identifies an absorption feature around 6250 °A to be chiefly due to hydrogen, as opposed to C II, Ne I, or Si II. Similarities between this observed feature and several SNe Ib suggest that hydrogen absorption attributable to a high velocity (& 12, 000 km s−1) H-rich shell is not rare in Type Ib events. Radio observations imply a shock velocity of v 0.13c and a progenitor star mass-loss rate of ˙M 1.4 × 10−5 M⊙ yr−1 (assuming wind velocity vw = 103 km s−1). This is consistent with independent constraints estimated from deep X-ray observations with Swift -XRT and Chandra. We find the multi-wavelength properties of SN2011ei to be consistent with the explosion of a lower-mass (3−4 M⊙), compact (R∗ 1×1011 cm), He core star. The star retained a thin hydrogen envelope at the time of outburst, and was embedded in an inhomogeneous circumstellar wind suggestive of modest episodic mass-loss. We conclude that SN2011ei’s rapid spectral metamorphosis calls attention to time-dependent classifications that bias estimates of explosion rates for a subset of Type IIb and Ib objects. Further, that important information about a progenitor star’s evolutionary state and associated mass-loss in the days to years prior to SN outburst can be inferred from timely multi-wavelength observations.
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/1930
dc.languageeng
dc.subjectSupernovae: general — supernova: individual (SN2011ei)
dc.titleMulti-wavelength observations of supernova 2011ei: time-dependent classification of type iib and ib supernovae and implications for their progenitors
dc.typeArtículo
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