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Hot Subdwarf Stars as the Donors of Type Ia Supernova Progenitors
Wang B(王博)1,2; Han ZW(韩占文)1,2
会议录名称ASP Conference Series - 6th Meeting on Hot Subdwarf Stars and Related Objects
2014-04
卷号481
页码233-236
产权排序第1完成单位
收录类别其他
会议名称6th Meeting on Hot Subdwarf Stars and Related Objects
会议地点Steward Observatory, University of Arizona, Tucson, Arizona, USA
摘要Type Ia supernovae (SNe Ia) play an important role in astrophysics and are crucial for the studies of stellar evolution, galaxy evolution and cosmology. They are generally thought to be thermonuclear explosions of accreting carbon-oxygen white dwarfs (CO WDs) in close binaries, however, the nature of the mass donor star is still unclear. It has recently been proposed that one sub-class of SNe Ia is sufficiently both distinct and common to be classified separately from the bulk of SNe Ia, with a suggested class name of “type Iax supernovae” (SN Iax), after SN 2002cx. We show that the population properties of this class can be understood if the events originate from helium double-detonation sub-Chandrasekhar mass explosions, in which a CO WD accumulates a helium layer from a non-degenerate hot subdwarf star. We have incorporated detailed binary evolution calculations for the progenitor systems into a binary population synthesis model to obtain birthrates and delay times for such events. The predicted Galactic event rate is in good agreement with the measured rates of SNe Iax. In addition, predicted delay times are consistent with the fact that SNe Iax have so far only been discovered in late-type galaxies. Based on the CO WD mass at explosion, we also estimate the distribution of resulting SN brightness, which can reproduce the empirical diversity of SNe Iax.
语种英语
出版者Astronomical Society of the Pacific
出版地San Francisco
归档日期2014-09-01
文献类型会议论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9650
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式
GB/T 7714
Wang B,Han ZW. Hot Subdwarf Stars as the Donors of Type Ia Supernova Progenitors[C]. San Francisco:Astronomical Society of the Pacific,2014:233-236.
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