Ruling out a massive asymptotic giant-branch star as the progenitor of supernova 2005cs

Ruling out a massive asymptotic giant-branch star as the progenitor of supernova 2005cs
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排除大质量渐近巨分支星是超新星 2005cs 的前身

DOI:
10.1111/j.1745-3933.2007.00285.x
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发表时间:
2007
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Letters
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通讯作者:
Eldridge J
Eldridge J
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作者:
Eldridge J

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We calculate the predictedUBVRIJHKabsolute 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 low, around 6 to 8 M⊙. However, such stars are thought to go through a second dredge-up to become asymptotic giant branch (AGB) stars. We show that had this occurred to the progenitor of 2005cs it would have been observed inJHKpre-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.
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