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arXiv 0905.2274astro-ph.HEastro-ph.SR
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第一颗恒星--Ib型超新星连接

First Stars -- Type Ib Supernovae Connection

Keni'chi Nomoto, Masaomi Tanaka, Yasuomi Kamiya, Nozomu Tominaga, Keiichi Maeda

摘要:

在极贫金属(EMP)恒星中观察到的非常特殊的丰度模式不能用普通的超新星核合成来解释,但可以通过超高能和超非球面爆炸中的核合成来很好地再现,即,超新星(HNe)。在此之前,这种HNe只在Ic型超新星中被观测到。在这里,我们研究了最近的Ib型超新星(SNe Ib)的性质。特别是,SN Ib 2008 D与发光的X射线瞬变080109相关联,被发现是一个比正常的核心坍缩超新星更具能量的爆炸。我们估计其母星的主序星质量为20- 25 M_sun,爆炸的动能约为6 × 10^{51}尔格。这些性质介于正常超新星和与伽马射线暴有关的超新星之间。这种高能的超新星Ib可能对早期宇宙的化学富集做出重要贡献。

英文摘要:

The very peculiar abundance patterns observed in extremely metal-poor (EMP) stars can not be explained by ordinary supernova nucleosynthesis but can be well-reproduced by nucleosynthesis in hyper-energetic and hyper-aspherical explosions, i.e., Hypernovae (HNe). Previously, such HNe have been observed only as Type Ic supernovae. Here, we examine the properties of recent Type Ib supernovae (SNe Ib). In particular, SN Ib 2008D associated with the luminous X-ray transient 080109 is found to be a more energetic explosion than normal core-collapse supernovae. We estimate that the progenitor's main sequence mass is 20--25 M_sun and a kinetic energy of explosion is ~ 6 x 10^{51} erg. These properties are intermediate between those of normal SNe and hypernovae associated with gamma-ray bursts. Such energetic SNe Ib can make important contribution to the chemical enrichment in the early Universe.

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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