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WD+RG systems as the progenitors of type Ia supernovae 预览

WD+RG systems as the progenitors of type Ia supernovae
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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.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(log Pi-M2i)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 possible ways for producing SNe Ia.Meanwhile,we find that the surviving companion stars from this channel have a low mass after the SN explosion,which may provide a means for the formation of the population of single low-mass WDs(<0.45M⊙). 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. 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 (log Pi_ M2^i) 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 possible ways for producing SNe Ia. Meanwhile, we find that the surviving companion stars from this channel have a low mass after the SN explosion, which may provide a means for the formation of the population of single low-mass WDs (〈0.45 M⊙).
作者 Bo Wang Zhan-Wen Han Bo Wang1,2 and Zhan-Wen Han1 1 National Astronomical Observatories/Yunnan Observatory,Chinese Academy of Sciences,Kunming 650011,China;2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China
出处 《天文和天体物理学研究:英文版》 SCIE CAS CSCD 2010年第3期 235-243,共9页 Chinese Journal of Astronomy and Astrophysics
基金 Supported by the National Natural Science Foundation of China. We thank the anonymous referee for his/her valuable comments that helped us to improve the paper. This work is supported by the National Natural Science Foundation of China (Grant No. 10821061), the National Basic Research Program of China (Grant No. 2007CB 815406), and the Yunnan Natural Science Foundation (Grant No. 08YJ041001).
关键词 IA型超新星 IA超新星 长周期生产 祖先 系统 宇宙演化 二进制文件 钱德拉塞卡 stars: evolution -- supernovae: general -- binaries: close -- white dwarfs
作者简介 wangbo @ynao.ac.cn
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