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arXiv 1004.0843astro-ph.SRastro-ph.HE
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双星系统中的Ib/c型超新星I。祖星的演化和性质

Type Ib/c supernovae in binary systems I. Evolution and properties of the progenitor stars

Sung-Chul Yoon, Stan E. Woosley, Norbert Langer

摘要:

我们调查的Ib/c型超新星(SN Ib/c)的祖先在近距离双星系统的演化,使用新的演化模型,包括旋转的影响,初始质量为12 - 25 Msun的主要组成部分,和单氦星的初始质量为2.8 - 20 Msun。我们发现,尽管潮汐相互作用对主恒星的旋转的影响,在不同的二元模型序列中的超新星前阶段的核心中保留的角动量的量收敛到一个类似于以前的单星模型中发现的值。这个量大到足以产生毫秒磁星,但太小了,不能产生磁星或长伽马射线暴。我们采用最新的估计沃尔夫-拉叶质量损失率,其影响SN Ib/c祖详细讨论。在恒星结构方面,在双星系统中的SN Ib/c祖星被预测有很大的最终质量范围,甚至可以达到7 Msun,氦包层为0.16 - 1.5 Msun。我们的研究结果表明,如果缺乏氦线的光谱中的SNe Ic是由于少量的氦,分布的初始和最终的质量的SNIc祖细胞应该是双峰。此外,我们发现,薄的氢层(0.001 - 0.01 Msun),预计将存在于许多SN Ib祖在presupernova阶段。我们表明,氢的存在下,连同一个相当厚的氦信封,可以导致一个显着的膨胀的一些SN Ib/c祖超新星爆炸的时间。这可能对冲击爆发和超新星光曲线产生重要影响。我们还认为,通过AB/B转移产生的薄氢层的一些SN祖细胞可能与IIb型超新星祖细胞相对较小的半径约为10 Rsun。

英文摘要:

We investigate the evolution of Type Ib/c supernova (SN Ib/c) progenitors in close binary systems, using new evolutionary models that include the effects of rotation, with initial masses of 12 - 25 Msun for the primary components, and of single helium stars with initial masses of 2.8 - 20 Msun. We find that, despite the impact of tidal interaction on the rotation of primary stars, the amount of angular momentum retained in the core at the presupernova stage in different binary model sequences converge to a value similar to those found in previous single star models. This amount is large enough to produce millisecond pulsars, but too small to produce magnetars or long gamma-ray bursts. We employ the most up-to-date estimate for the Wolf-Rayet mass loss rate, and its implications for SN Ib/c progenitors are discussed in detail. In terms of stellar structure, SN Ib/c progenitors in binary systems are predicted to have a wide range of final masses even up to 7 Msun, with helium envelopes of 0.16 - 1.5 Msun. Our results indicate that, if the lack of helium lines in the spectra of SNe Ic were due to small amounts of helium, the distribution of both initial and final masses of SN Ic progenitors should be bimodal. Furthermore, we find that a thin hydrogen layer (0.001 - 0.01 Msun) is expected to be present in many SN Ib progenitors at the presupernova stage. We show that the presence of hydrogen, together with a rather thick helium envelope, can lead to a significant expansion of some SN Ib/c progenitors by the time of supernova explosion. This may have important consequences for the shock break-out and supernova light curve. We also argue that some SN progenitors with thin hydrogen layers produced via Case AB/B transfer might be related to Type IIb supernova progenitors with relatively small radii of about 10 Rsun.

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