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He-accreting carbon-oxygen white dwarfs and Type Ia supernovae
Wang B(王博)1,2; Podsiadlowski, Philipp3; Han ZW(韩占文)1,2; Wang, Bo(Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China)
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2017-12-01
卷号472期号:2页码:1593-1599
DOI10.1093/mnras/stx2192
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Stars: Evolution Supernovae: General White Dwarfs
摘要He accretion on to carbon-oxygen white dwarfs (CO WDs) plays a fundamental role when studying the formation of Type Ia supernovae (SNe Ia). Employing the mesa stellar evolution code, we calculated the long-term evolution of He-accreting CO WDs. Previous studies usually supposed that a WD can grow in mass to the Chandrasekhar limit in the stable He burning region and finally produce an SN Ia. However, in this study, we find that off-centre carbon ignition occurs in the stable He burning region if the accretion rate is above a critical value (similar to 2.05 x 10(-6) M-circle dot yr(-1)), resulting in accretion-induced collapse rather than an SN Ia. If the accretion rate is below the critical value, explosive carbon ignition will eventually happen in the centre producing an SN Ia. Taking into account the possibility of off-centre carbon ignition, we have re-determined the initial parameter space that produces SNe Ia in the He star donor channel, one of the promising channels to produce SNe Ia in young populations. Since this parameter space is smaller than was found in the previous study of Wang et al. (2009), the SN Ia rates are also correspondingly smaller. We also determined the chemical abundance profile of the He-accreting WDs at the moment of explosive carbon ignition, which can be used as initial input for SN Ia explosion models.
项目资助者NSFC(11673059, 11390374, 11521303) ; Yunnan Province(2013HA005, 2013HB097) ; CAS(QYZDB-SSW-SYS001, KJZD-EW-M06-01)
语种英语
学科领域天文学
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2017-09-25
WOS记录号WOS:000413082900026
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]X-RAY SOURCES ; DEGENERATE DWARF ; BURNING SHELLS ; KPD 1930+2752 ; LIGHT CURVES ; DELAY TIMES ; HELIUM NOVA ; PROGENITORS ; EVOLUTION ; STAR
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11903
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
通讯作者Wang, Bo(Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China)
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, CAS, Kunming 650216, China
2.Center for Astronomical Mega-Science, CAS, Beijing 100012, China
3.Department of Astronomy, Oxford University, Oxford OX1 3RH, UK
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Wang B,Podsiadlowski, Philipp,Han ZW,et al. He-accreting carbon-oxygen white dwarfs and Type Ia supernovae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,472(2):1593-1599.
APA Wang B,Podsiadlowski, Philipp,Han ZW,&Wang, Bo.(2017).He-accreting carbon-oxygen white dwarfs and Type Ia supernovae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,472(2),1593-1599.
MLA Wang B,et al."He-accreting carbon-oxygen white dwarfs and Type Ia supernovae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 472.2(2017):1593-1599.
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