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The violent white dwarf merger scenario for the progenitors of Type Ia supernovae
Liu DD(刘栋栋)1,2,3; Wang B(王博)1,2; Podsiadlowski, Ph.4; Han ZW(韩占文)1,2; Liu, DD
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-10-01
卷号461期号:4页码:3653-3662
DOI10.1093/mnras/stw1575
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Recent observations suggest that some Type Ia supernovae (SNe Ia) originate from the merging of two carbon-oxygen white dwarfs (CO WDs). Meanwhile, recent hydrodynamical simulations have indicated that the accretion-induced collapse may be avoided under certain conditions when double WDs merge violently. However, the properties of SNe Ia from this violent merger scenario are highly dependent on a particular mass-accretion stage, the so-called WD + He subgiant channel, during which the primary WD is able to increase its mass by accreting He-rich material from an He subgiant before the systems evolves into a doubleWD system. In this paper, we aim to study this particular evolutionary stage systematically and give the properties of violent WD mergers. By employing the Eggleton stellar evolution code, we followed a large number of binary calculations and obtained the regions in parameter space for producing violent mergers based on the WD + He subgiant channel. According to these simulations, we found that the primary WDs can increase their mass by similar to 0.10-0.45M(circle dot) during the mass-accretion stage. We then conducted a series of binary population synthesis calculations and found that the Galactic SN Ia birthrate from this channel is about 0.01-0.4 x 10(-3) yr(-1). This suggests that the violent WD mergers from this channel may only contribute to similar to 0.3-10 per cent of all SNe Ia in our Galaxy. The delay times of violent WD mergers from this channel are >= 1.7Gyr, contributing to the SNe Ia in old populations. We also found that the WD + He subgiant channel is the dominant way for producing violent WD mergers that may be able to eventually explode as SNe Ia.
项目资助者National Basic Research Program of China (973 programme)(2014CB845700) ; National Natural Science Foundation of China(11322327 ; Chinese Academy of Sciences(KJZD-EW-M06-01 ; Natural Science Foundation of Yunnan Province(2013HB097 ; Youth Innovation Promotion Association CAS ; 11390374 ; XDB09010202) ; 2013FB083 ; 11521303) ; 2013HA005)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2016-12-06
WOS记录号WOS:000383514900022
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DELAY-TIME DISTRIBUTION ; SINGLE-DEGENERATE CHANNEL ; CLOSE BINARY EVOLUTION ; STAR DONOR CHANNEL ; INITIAL MASS ; SN 2011FE ; THERMONUCLEAR EXPLOSIONS ; DIFFERENT METALLICITIES ; POPULATION SYNTHESIS ; GALAXY CLUSTERS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9706
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Liu, DD
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Department of Astronomy, Oxford University, Oxford OX1 3RH, UK
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Liu DD,Wang B,Podsiadlowski, Ph.,et al. The violent white dwarf merger scenario for the progenitors of Type Ia supernovae[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,461(4):3653-3662.
APA Liu DD,Wang B,Podsiadlowski, Ph.,Han ZW,&Liu, DD.(2016).The violent white dwarf merger scenario for the progenitors of Type Ia supernovae.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,461(4),3653-3662.
MLA Liu DD,et al."The violent white dwarf merger scenario for the progenitors of Type Ia supernovae".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 461.4(2016):3653-3662.
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