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Formation of Extremely Low-mass White Dwarfs in Double Degenerates
Li ZW(李振威)1,2,3; Chen XF(陈雪飞)1,2,4; Chen HL(陈海亮)1,2; Han ZW(韩占文)1,2,4
Source PublicationASTROPHYSICAL JOURNAL
2019-02-01
Volume871Issue:2Pages:15
DOI10.3847/1538-4357/aaf9a1
Contribution Rank第1完成单位
Indexed BySCI
Keywordbinaries: close stars: formation white dwarfs
Abstract

Extremely low-mass white dwarfs (ELM WDs) are helium WDs with a mass less than similar to 0.3M(circle dot). Most ELM WDs are found in double degenerates (DDs) in the ELM Survey led by Brown and Kilic. These systems are supposed to be significant gravitational-wave sources in the mHz frequency. In this paper, we first analyzed the observational characteristics of ELM WDs and found that there are two distinct groups in the ELM WD mass and orbital period plane, indicating two different formation scenarios of such objects, i.e., a stable Roche lobe overflow channel (RL channel) and common envelope ejection channel (CE channel). We then systematically investigated the formation of ELM WDs in DDs by a combination of detailed binary evolution calculation and binary population synthesis. Our study shows that the majority of ELM WDs with mass less than 0.22 M-circle dot are formed from the RL channel. The most common progenitor mass in this way is in the range of 1.15-1.45 M-circle dot, and the resulting ELM WDs have a peak around 0.18M(circle dot) when selection effects are taken into account, consistent with observations. The ELM WDs with a mass larger than 0.22Me are more likely to be from the CE channel and have a peak of ELM WD mass around 0.25 M-circle dot, which needs to be confirmed by future observations. By assuming a constant star formation rate of 2M(circle dot) yr(-1) for a Milky Way-like galaxy, the birth rate and local density are 5 x 10(-4) yr(-1) and 1500 kpc(-3), respectively, for DDs with an ELM WD mass less than 0.25 M-circle dot.

Funding ProjectNatural Science Foundation of China[11733008] ; Natural Science Foundation of China[11521303] ; Natural Science Foundation of China[11703081] ; Natural Science Foundation of China[11422324] ; National Ten-thousand talents program, Yunnan province[2017HC018] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; CAS light of West China Program
Funding OrganizationNatural Science Foundation of China[11733008, 11521303, 11703081, 11422324] ; National Ten-thousand talents program, Yunnan province[2017HC018] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; CAS light of West China Program
Language英语
Subject Area天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000457181200002
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCLOSE BINARY EVOLUTION ; RED-GIANT STAR ; STELLAR EVOLUTION ; PROGENITORS ; SYSTEMS ; EFFICIENCY ; DISCOVERY ; CHANNEL ; RICH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/19329
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 AuthorChen XF(陈雪飞)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, People's Republic of China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science, People's Republic of China
3.University of the Chinese Academy of Science, Yuquan Road 19, Shijingshan Block, 100049, Beijing, People's Republic of China
4.Center for Astronomical Mega-Science, Chinese Academy of Science, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li ZW,Chen XF,Chen HL,et al. Formation of Extremely Low-mass White Dwarfs in Double Degenerates[J]. ASTROPHYSICAL JOURNAL,2019,871(2):15.
APA Li ZW,Chen XF,Chen HL,&Han ZW.(2019).Formation of Extremely Low-mass White Dwarfs in Double Degenerates.ASTROPHYSICAL JOURNAL,871(2),15.
MLA Li ZW,et al."Formation of Extremely Low-mass White Dwarfs in Double Degenerates".ASTROPHYSICAL JOURNAL 871.2(2019):15.
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