Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-05
Mon.Not.Roy.Astron.Soc.Lett.376:L52-L56,2007
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, Letter accepted for publication in MNRAS
Scientific paper
10.1111/j.1745-3933.2007.00285.x
We calculate the predicted UBVRIJHK absolute magnitudes for models of supernova progenitors and apply the result to the case of supernova 2005cs. We agree with previous results that the initial mass of the star was of low, around 6 to 8 M(sun). However such stars are thought to go through second dredge-up to become AGB stars. We show that had this occurred to the progenitor of 2005cs it would have been observed in JHK pre-explosion images. The progenitor was not detected in these bands and therefore we conclude that it was not an AGB star. Furthermore if some AGB stars do produce supernovae they will have a clear signature in pre-explosion near-infrared images. Electron-capture supernovae are thought to occur in AGB stars, hence the implication is that 2005cs was not an electron-capture supernova but was the collapse of an iron core.
Eldridge John J.
Mattila Seppo
Smartt Stephen J.
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