Accreting He-rich material onto carbon-oxygen white dwarfs until explosive carbon ignition

作     者：Cheng-YuanWu Dong-Dong Liu Wei-Hong Zhou Bo Wang 

作者机构：Yunnan ObservatoriesChinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial ObjectsChinese Academy of SciencesKunming 650216China University of Chinese Academy of SciencesBeiiing 100049China Yunnan Minzu UniversityKunming 650031China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第10期

页      面：93-98页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Basic Research Program of China(973 program,2014CB845700) the National Natural Science Foundation of China(Nos.11322327,11390374,11521303 and 61561053) the Chinese Academy of Sciences(Nos.KJZD-EW-M06-01 and XDB09010202) the Natural Science Foundation of Yunnan Province(Nos.2013HB097 and 2013FB083) the Youth Innovation Promotion Association,CAS 

主　　题：stars: evolution    binaries: close    supernovae: general    white dwarfs 

摘      要：Type Ia supernovae （SNe Ia） play an important role in studies of cosmology and galactic chemi- cal evolution. They are believed to be thermonuclear explosions of carbon-oxygen white dwarfs （CO WDs） when their masses approach the Chandrasekar （Ch） mass limit. However, it is still not completely under- stood how a CO WD increases its mass to the Ch-mass limit in the classical single-degenerate （SD） model. In this paper, we studied the mass accretion process in the SD model to examine whether the WD can explode as an SN Ia. Employing the stellar evolution code called modules for experiments in stellar as- trophysics （MESA）, we simulated the He accretion process onto CO WDs. We found that the WD can increase its mass to the Ch-mass limit through the SD model and explosive carbon ignition finally occurs in its center, which will lead to an SN Ia explosion. Our results imply that SNe Ia can be produced from the SD model through steady helium accretion. Moreover, this work can provide initial input parameters for explosion models of SNe Ia.