标题： WD+RG系统作为I型超新星的前身星 显示英文标题

标题： WD+RG systems as the progenitors of Type Ia supernovae

摘要： Ia型超新星（SNe Ia）在宇宙演化研究中起着重要作用，特别是在宇宙学中。 过去几年提出了几种SNe Ia的前身星模型。 在本文中，通过考虑吸积盘不稳定性对白矮星（WD）双星演化的效应，我们对SNe Ia的WD + 红巨星（RG）通道进行了详细的双星演化计算，在该通道中，一个碳氧白矮星从红巨星恒星吸积物质，使其质量增加到钱德拉塞卡质量极限。 根据这些计算，我们绘制了该通道中不同WD质量的SNe Ia的初始和最终参数在轨道周期-次级质量平面上的分布。 我们讨论了占空比值变化对产生SNe Ia区域的影响。 与之前的研究类似，这项工作也表明，长周期矮新星为产生SNe Ia提供了一种可能的途径。 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WD（<0.45Msun）群体的形成提供一种方法。 显示英文摘要

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).