Journal Article

Massive stars exploding in a He-rich circumstellar medium – II. The transitional case of SN 2005la

A. Pastorello, R. M. Quimby, S. J. Smartt, S. Mattila, H. Navasardyan, R. M. Crockett, N. Elias-Rosa, P. Mondol, J. C. Wheeler and D. R. Young

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 1, pages 131-140
Published in print September 2008 | ISSN: 0035-8711
Published online August 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13603.x
Massive stars exploding in a He-rich circumstellar medium – II. The transitional case of SN 2005la

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We present photometric and spectroscopic data of the peculiar SN 2005la, an object which shows an optical light curve with some luminosity fluctuations and spectra with comparably strong narrow hydrogen and helium lines, probably of circumstellar nature. The increasing full width at half-maximum velocity of these lines is indicative of an acceleration of the circumstellar material. SN 2005la exhibits hybrid properties, sharing some similarities with both Type IIn supernovae and 2006jc-like (Type Ibn) events. We propose that the progenitor of SN 2005la was a very young Wolf–Rayet (WN-type) star which experienced mass ejection episodes shortly before core collapse.

Keywords: supernovae: general; supernovae: individual: SN 2005la; supernovae: individual: SN 2006jc

Journal Article.  6173 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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