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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
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-10-01
Volume461Issue:4Pages:3653-3662
DOI10.1093/mnras/stw1575
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Stars: Evolution Supernovae: General White Dwarfs
Abstract

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.

Funding ProjectNational Basic Research Program of China (973 programme)[2014CB845700] ; National Natural Science Foundation of China[11322327] ; National Natural Science Foundation of China[11390374] ; National Natural Science Foundation of China[11521303] ; Chinese Academy of Sciences[KJZD-EW-M06-01] ; Chinese Academy of Sciences[XDB09010202] ; Natural Science Foundation of Yunnan Province[2013HB097] ; Natural Science Foundation of Yunnan Province[2013FB083] ; Natural Science Foundation of Yunnan Province[2013HA005] ; Youth Innovation Promotion Association CAS
Funding OrganizationNational Basic Research Program of China (973 programme)[2014CB845700] ; National Natural Science Foundation of China[11322327, 11390374, 11521303] ; Chinese Academy of Sciences[KJZD-EW-M06-01, XDB09010202] ; Natural Science Foundation of Yunnan Province[2013HB097, 2013FB083, 2013HA005] ; Youth Innovation Promotion Association CAS
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
Archive Date2016-12-06
WOS IDWOS:000383514900022
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDELAY-TIME DISTRIBUTION ; SINGLE-DEGENERATE CHANNEL ; CLOSE BINARY EVOLUTION ; STAR DONOR CHANNEL ; INITIAL MASS ; SN 2011FE ; THERMONUCLEAR EXPLOSIONS ; DIFFERENT METALLICITIES ; POPULATION SYNTHESIS ; GALAXY CLUSTERS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9706
Collection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
Corresponding AuthorLiu DD(刘栋栋); Wang B(王博); Podsiadlowski, Ph.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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.(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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