A1 Refereed original research article in a scientific journal
Massive stars exploding in a He-rich circumstellar medium - II. The transitional case of SN 2005la
Authors: Pastorello A, Quimby RM, Smartt SJ, Mattila S, Navasardyan H, Crockett RM, Elias-Rosa N, Mondol P, Wheeler JC, Young DR
Publisher: WILEY-BLACKWELL PUBLISHING, INC
Publication year: 2008
Journal:Monthly Notices of the Royal Astronomical Society
Journal name in sourceMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 389
Issue: 1
First page : 131
Last page: 140
Number of pages: 10
ISSN: 0035-8711
DOI: https://doi.org/10.1111/j.1365-2966.2008.13603.x
Abstract
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.
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.
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