Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-07
Phil.Trans.Roy.Soc.Lond.A366:4441-4452,2008
Astronomy and Astrophysics
Astrophysics
11 pages, 4 figures, review to appear in the Triennial edition of the Philosophical Transations of the Royal Society A. Conten
Scientific paper
10.1098/rsta.2008.0160
The study of the stars that explode as supernovae used to be a forensic study, working backwards from the remnants of the star. This changed in 1987 when the first progenitor star was identified in pre-explosion images. Currently there are 8 detected progenitors with another 21 non-detections, for which only a limit on the pre-explosion luminosity can be placed. This new avenue of supernova research has led to many interesting conclusions, most importantly that the progenitors of the most common supernovae, type IIP, are red supergiants as theory has long predicted. However no progenitors have been detected thus far for the hydrogen-free type Ib/c supernovae which, given the expected progenitors, is an unlikely result. Also observations have begun to show evidence that luminous blue variables, which are among the most massive stars, may directly explode as supernovae. These results contradict current stellar evolution theory. This suggests that we may need to update our understanding.
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