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A Wolf-Rayet-like progenitor of SN 2013cu from spectral observations of a stellar wind
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2014 (Engelska)Ingår i: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 509, nr 7501, s. 471-+Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The explosive fate of massive Wolf-Rayet stars(1) (WRSs) is a key open question in stellar physics. An appealing option is that hydrogen-deficient WRSs are the progenitors of some hydrogen-poor supernova explosions of types IIb, Ib and Ic (ref. 2). A blue object, having luminosity and colours consistent with those of some WRSs, has recently been identified in pre-explosion images at the location of a supernova of type Ib (ref. 3), but has not yet been conclusively determined to have been the progenitor. Similar work has so far only resulted in non-detections(4). Comparison of early photometric observations of type Ic supernovae with theoretical models suggests that the progenitor stars had radii of less than 1012 centimetres, as expected for some WRSs(5). The signature of WRSs, their emission line spectra, cannot be probed by such studies. Here we report the detection of strong emission lines in a spectrum of type IIb supernova 2013cu (iPTF13ast) obtained approximately 15.5 hours after explosion (by 'flash spectroscopy', which captures the effects of the supernova explosion shock breakout flash on material surrounding the progenitor star). We identify Wolf-Rayet-like wind signatures, suggesting a progenitor of the WN(h) subclass (those WRSs with winds dominated by helium and nitrogen, with traces of hydrogen). The extent of this dense wind may indicate increased mass loss from the progenitor shortly before its explosion, consistent with recent theoretical predictions(6).

Ort, förlag, år, upplaga, sidor
2014. Vol. 509, nr 7501, s. 471-+
Nationell ämneskategori
Astronomi, astrofysik och kosmologi
Identifikatorer
URN: urn:nbn:se:su:diva-105190DOI: 10.1038/nature13304ISI: 000336126000034OAI: oai:DiVA.org:su-105190DiVA, id: diva2:732527
Forskningsfinansiär
VetenskapsrådetEU, FP7, Sjunde ramprogrammet
Anmärkning

AuthorCount:20;

Tillgänglig från: 2014-07-04 Skapad: 2014-06-24 Senast uppdaterad: 2019-12-04Bibliografiskt granskad

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Av författaren/redaktören
Taddia, FrancescoSollerman, Jesper
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Institutionen för astronomiOskar Klein-centrum för kosmopartikelfysik (OKC)
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Nature
Astronomi, astrofysik och kosmologi

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