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Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs
Wu CY(吴程远)1,2,3,4; Xiong, Heran5; Wang, Xiaofeng4,6
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2022-03-31
卷号512期号:2页码:2972-2987
DOI10.1093/mnras/stac273
产权排序第1完成单位
收录类别SCI ; EI
关键词stars: evolution binaries: close stars: white dwarfs
摘要

Ultra-massive white dwarfs (UMWDs) with masses larger than 1.05M(circle dot) are basically believed to harbour oxygen-neon (ONe) cores. Recently, Gaia data have revealed an enhancement of UMWDs on the Hertzsprung-Russell diagram (HRD), which indicates that an extra cooling delay mechanism such as crystallization and elemental sedimentation may exist in UMWDs. Further studies have suggested that some UMWDs should have experienced fairly long cooling delays, implying that they are carbon-oxygen (CO) WDs. However, the formation mechanism of these UMCOWDs is still under debate. In this work, we investigate whether the mergers of massive CO WDs with helium WDs (He WDs) can evolve to UMCOWDs. By employing the stellar evolution code MESA, we construct double WD merger remnants to investigate their final fates. We found that the post-merger evolution of the remnants is similar to R CrB stars. The helium burning of the He shell leads to mass growth of the CO core at a rate of 2.0 x 10(-6) -5.0 x 10(-6) M-circle dot yr(-1). The final CO WD mass is influenced by the wind mass-loss rate during the post-merger evolution, and cannot exceed about 1.2M(circle dot). Remnants with core masses larger than 1.2 M-circle dot will experience surface carbon ignition, which may finally end their lives as ONe WDs. The current results imply that at least some UMWDs that experience extra-long cooling delays may stem from the merging of CO WDs and He WDs.

资助项目National Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[12003013] ; National Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[12033003] ; National Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[11633002] ; Beijing Academy of Science and Technology[DZ:BS202002]
项目资助者National Natural Science Foundation of China (NSFC)National Natural Science Foundation of China (NSFC)[12003013, 12033003, 11633002] ; Beijing Academy of Science and Technology[DZ:BS202002]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者OXFORD UNIV PRESS
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS记录号WOS:000776894900002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]R-CORONAE-BOREALIS ; ACCRETION-INDUCED COLLAPSE ; EXTREME HELIUM ; EVOLUTION ; STARS ; BINARIES ; IMPACT ; FATE ; METALLICITY ; PROGENITORS
EI入藏号20221611993298
EI主题词Merging
EI分类号641.2 Heat Transfer - 657.2 Extraterrestrial Physics and Stellar Phenomena - 804 Chemical Products Generally
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.ynao.ac.cn/handle/114a53/25029
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Wu CY(吴程远); Xiong, Heran
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, Yunnan Observatories, CAS, Kunming 650216, China;
3.University of Chinese Academy of Sciences, Beijing 100049, China;
4.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084, China;
5.Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611, Australia;
6.Beijing Planetarium, Beijing Academy of Sciences and Technology, Beijing, 100044, China
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
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Wu CY,Xiong, Heran,Wang, Xiaofeng. Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2022,512(2):2972-2987.
APA Wu CY,Xiong, Heran,&Wang, Xiaofeng.(2022).Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,512(2),2972-2987.
MLA Wu CY,et al."Formation of ultra-massive carbon-oxygen white dwarfs from the merger of carbon-oxygen and helium white dwarf pairs".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 512.2(2022):2972-2987.
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