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A Roche lobe-filling hot subdwarf and white dwarf binary: possible detection of an ejected common envelope
Li JD(李江丹)1,2,3; Onken, Christopher A4,5; Wolf, Christian4,5; Németh, Péter6,7; Bessell, Mike4; Li ZW(李振威)1,2; Zhang, Xiaobin8; Li, Jiao9; Wang LQ(王璐茜)1; Li LF(李立芳)1,2; Luo, Yangping10; Chen HL(陈海亮)1,2; Ji KF(季凯帆)1; Chen XF(陈雪飞)1,2; Han ZW(韩占文)1,2,3
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2022-08-05
卷号515期号:3页码:3370-3382
DOI10.1093/mnras/stac1768
产权排序第1完成单位
收录类别SCI ; EI
关键词binaries: close stars: individual: J192054.50-200135.5 subdwarfs white dwarfs
摘要

Binaries consisting of a hot subdwarf star and an accreting white dwarf (WD) are sources of gravitational wave radiation at low frequencies and possible progenitors of Type Ia supernovae if the WD mass is large enough. Here, we report the discovery of the third binary known of this kind: It consists of a hot subdwarf O (sdO) star and a WD with an orbital period of 3.495 h and an orbital shrinkage of 0.1 s in 6 yr. The sdO star overfills its Roche lobe and likely transfers mass to the WD via an accretion disc. From spectroscopy, we obtain an effective temperature of T-eff = 54 240 +/- 1840 K and a surface gravity of log g = 4.841 +/- 0.108 for the sdO star. From the light curve analysis, we obtain an sdO mass of M-sdO = 0.55 M-circle dot and a mass ratio of q = M-WD/M-sdO = 0.738 +/- 0.001. Also, we estimate that the disc has a radius of similar to 0.41 R-circle dot and a thickness of similar to 0.18 R-circle dot. The origin of this binary is probably a common envelope ejection channel, where the progenitor of the sdO star is either a red giant branch star or, more likely, an early asymptotic giant branch star; the sdO star will subsequently evolve into a WD and merge with its WD companion, likely resulting in an R Coronae Borealis (R CrB) star. The outstanding feature in the spectrum of this object is strong Ca H&K lines, which are blue-shifted by similar to 200 km s(-1) and likely originate from the recently ejected common envelope, and we estimated that the remnant common envelope (CE) material in the binary system has a density similar to 6 x 10(-1)0 g cm(-3).

资助项目National Natural Science Foundation of China[12090040/3] ; National Natural Science Foundation of China[12125303] ; National Natural Science Foundation of China[11733008] ; National Natural Science Foundation of China[12103086] ; National Key R&D Program of China[2021YFA1600401/3] ; China Manned Space Project[CMS-CSST-2021-A10] ; Australian Research Council (ARC)[DP190100252] ; Grant Agency of the Czech Republic[GA.CR 22-34467S] ; Polish National Science Centre[UMO-2017/26/E/ST9/00703] ; Polish National Science Centre[UMO-2017/25/B/ST9/02218] ; National Aeronautics and Space Administration ; NASA Science Mission Directorate ; NASA[NAS 5-26555] ; Australian Research Council[LE130100104] ; Australian National University ; Swinburne University of Technology ; University of Queensland ; University of Western Australia ; University of Melbourne ; Curtin University of Technology ; Monash University, ; Australian Astronomical Observatory ; Astronomy Australia Limited (AAL) ; Australian Government through the Commonwealth's Education Investment Fund (EIF) ; National Collaborative Research Infrastructure Strategy (NCRIS) ; National eResearch Collaboration Tools and Resources (NeCTAR) ; the Australian National Data Service Projects (ANDS) ; [RVO:67985815]
项目资助者National Natural Science Foundation of China[12090040/3, 12125303, 11733008, 12103086] ; National Key R&D Program of China[2021YFA1600401/3] ; China Manned Space Project[CMS-CSST-2021-A10] ; Australian Research Council (ARC)[DP190100252] ; Grant Agency of the Czech Republic[GA.CR 22-34467S] ; Polish National Science Centre[UMO-2017/26/E/ST9/00703, UMO-2017/25/B/ST9/02218] ; National Aeronautics and Space Administration ; NASA Science Mission Directorate ; NASA[NAS 5-26555] ; Australian Research Council[LE130100104] ; Australian National University ; Swinburne University of Technology ; University of Queensland ; University of Western Australia ; University of Melbourne ; Curtin University of Technology ; Monash University, ; Australian Astronomical Observatory ; Astronomy Australia Limited (AAL) ; Australian Government through the Commonwealth's Education Investment Fund (EIF) ; National Collaborative Research Infrastructure Strategy (NCRIS) ; National eResearch Collaboration Tools and Resources (NeCTAR) ; the Australian National Data Service Projects (ANDS) ; [RVO:67985815]
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:000836707600002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]B-STARS ; CONVECTIVE BOUNDARIES ; ORBITAL DECAY ; MASS-TRANSFER ; EVOLUTION ; INTERSTELLAR ; ORIGIN ; APPROXIMATIONS ; DETONATIONS ; KINEMATICS
EI入藏号20223512626464
EI主题词White dwarfs
EI分类号657.2Extraterrestrial Physics and Stellar Phenomena ; 931.5Gravitation, Relativity and String Theory
引用统计
被引频次:6[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/114a53/25541
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
天文技术实验室
通讯作者Li JD(李江丹); Wolf, Christian; Han ZW(韩占文)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), 396 Yangfangwang, Guandu District, Kunming 650011, P. R. China;
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, P. R. China;
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
4.Research School of Astronomy and Astrophysics, Australian National University, Weston Creek ACT 2611, Australia;
5.Centre for Gravitational Astrophysics, Australian National University, Canberra ACT 2600, Australia;
6.Stellar Department, Astronomical Institute of the Czech Academy of Sciences, CZ-25 165, Ondřejov, Czech Republic;
7.Astroserver.org, Fő tér 1, 8533 Malomsok, Hungary;
8.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, P. R. China;
9.Key Lab of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, P. R. China;
10.Department of Astronomy, China West Normal University, Nanchong, 637002, P. R. 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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GB/T 7714
Li JD,Onken, Christopher A,Wolf, Christian,et al. A Roche lobe-filling hot subdwarf and white dwarf binary: possible detection of an ejected common envelope[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2022,515(3):3370-3382.
APA Li JD.,Onken, Christopher A.,Wolf, Christian.,Németh, Péter.,Bessell, Mike.,...&Han ZW.(2022).A Roche lobe-filling hot subdwarf and white dwarf binary: possible detection of an ejected common envelope.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,515(3),3370-3382.
MLA Li JD,et al."A Roche lobe-filling hot subdwarf and white dwarf binary: possible detection of an ejected common envelope".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 515.3(2022):3370-3382.
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