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arXiv 0705.3459astro-ph
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关于原行星盘超新星富集的可能性

On the likelihood of supernova enrichment of protoplanetary disks

Jonathan P. Williams, Eric Gaidos

摘要:

我们估计的可能性,直接注入到原行星盘使用的模型,其中的恒星与磁盘的数量随时间线性减少,和集群扩展随时间线性,使其表面密度是独立的恒星数量的超新星喷出物。盘耗散和主序星寿命的相似性意味着典型的超新星祖先质量非常大,约为75-100 Msun。这样的大质量恒星只在成员数大于10^4的星团中发现。此外,超新星周围只有一个小区域,在这个区域内,磁盘可以在爆炸中幸存下来,但可以富集到太阳系中观察到的水平。这两个因素限制了原行星盘超新星富集的总体可能性<1%。如果陨石中存在短寿命的放射性核素是以这种方式来解释的话,那么太阳系很可能是在银河系中最大的星团之一形成的,比猎户座大两个数量级以上,其中多个超新星在短时间内撞击了许多圆盘。

英文摘要:

We estimate the likelihood of direct injection of supernova ejecta into protoplanetary disks using a model in which the number of stars with disks decreases linearly with time, and clusters expand linearly with time such that their surface density is independent of stellar number. The similarity of disk dissipation and main sequence lifetimes implies that the typical supernova progenitor is very massive, ~ 75-100 Msun. Such massive stars are found only in clusters with > 10^4 members. Moreover, there is only a small region around a supernova within which disks can survive the blast yet be enriched to the level observed in the Solar System. These two factors limit the overall likelihood of supernova enrichment of a protoplanetary disk to < 1%. If the presence of short lived radionucleides in meteorites is to be explained in this way, however, the Solar System most likely formed in one of the largest clusters in the Galaxy, more than two orders of magnitude greater than Orion, where multiple supernovae impacted many disks in a short period of time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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