Massive stars exploding in a He-rich circumstellar medium – II. The transitional case of SN 2005la |
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| Authors: | A. Pastorello,R. M. Quimby &dagger ,S. J. Smartt,S. Mattila,H. Navasardyan,R. M. Crockett,N. Elias-Rosa,P. Mondol,J. C. Wheeler, D. R. Young |
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| Affiliation: | Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN;Department of Astronomy, University of Texas, Austin, TX 78712, USA;Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland;INAF Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85741 Garching bei München, Germany |
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| 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. |
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| Keywords: | supernovae: general supernovae: individual: SN 2005la supernovae: individual: SN 2006jc |
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