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A Wolf-Rayet-like progenitor of SN 2013cu from spectral observations of a stellar wind.

Gal-Yam, A and Arcavi, I and Ofek, EO and Ben-Ami, S and Cenko, SB and Kasliwal, MM and Cao, Y and Yaron, O and Tal, D and Silverman, JM and Horesh, A and De Cia, A and Taddia, F and Sollerman, J and Perley, DA and Vreeswijk, PM and Kulkarni, SR and Nugent, PE and Filippenko, AV and Wheeler, JC (2014) A Wolf-Rayet-like progenitor of SN 2013cu from spectral observations of a stellar wind. Nature, 509 (7501). pp. 471-474. ISSN 0028-0836

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Abstract

The explosive fate of massive Wolf-Rayet stars (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. Comparison of early photometric observations of type Ic supernovae with theoretical models suggests that the progenitor stars had radii of less than 10(12) centimetres, as expected for some WRSs. 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.

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Nature Publishing Group
Related URLs:
Date Deposited: 17 May 2017 11:14
Last Modified: 17 May 2017 11:14
DOI or Identification number: 10.1038/nature13304
URI: http://researchonline.ljmu.ac.uk/id/eprint/6448

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