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arXiv 1003.4568astro-ph.SR
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WD + RG系统是Ia型超新星的祖先

WD+RG systems as the progenitors of Type Ia supernovae

Bo Wang, Zhanwen Han

摘要:

Ia型超新星(SNe Ia)在宇宙演化研究中,特别是在宇宙学研究中起着重要的作用。在过去的几年里,人们提出了几种Ia型超新星的祖先模型。考虑吸积盘不稳定性对白矮星(WD)双星演化的影响,对Ia型超新星WD +红巨星(RG)通道进行了详细的双星演化计算.根据这些计算,我们绘制出的初始和最终参数SNe Ia在轨道周期-第二质量平面的各种WD质量为这个通道。我们讨论了占空比值的变化对Ia型超新星产生区域的影响。与以往的研究类似,本研究也表明长周期矮新星为Ia超新星的产生提供了可能的途径。同时,我们发现该通道中幸存的伴星在超新星爆发后质量较低,这可能为单个低质量WDs(<0.45Msun)的形成提供了一种途径。

英文摘要:

Type Ia supernovae (SNe Ia) play an important role in the study of cosmic evolution, especially in cosmology. There are several progenitor models for SNe Ia proposed in the past years. In this paper, by considering the effect of accretion disk instability on the evolution of white dwarf (WD) binaries, we performed detailed binary evolution calculations for the WD + red-giant (RG) channel of SNe Ia, in which a carbon-oxygen WD accretes material from a RG star to increase its mass to the Chandrasekhar mass limit. According to these calculations, we mapped out the initial and final parameters for SNe Ia in the orbital period--secondary mass plane for various WD masses for this channel. We discussed the influence of the variation of the duty cycle value on the regions for producing SNe Ia. Similar to previous studies, this work also indicates that the long-period dwarf novae offer a possible ways for producing SNe Ia. Meanwhile, we find that the surviving companion stars from this channel have a low mass after SN explosion, which may provide a means for the formation of the population of single low-mass WDs (<0.45Msun).

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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