New insights into the helium star formation channel of AM CVn systems with explanations of Gaia14aae and ZTFJ1637+49 | |
Sarkar, Arnab3; Ge HW(葛宏伟)1,2,3; Tout, Christopher A3 | |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
2023-02 | |
卷号 | 519期号:2页码:2567-2577 |
关键词 | binaries: close stars: magnetic field stars: mass-loss novae cataclysmic variables stars: rotation white dwarfs |
ISSN号 | 0035-8711 |
DOI | 10.1093/mnras/stac3688 |
产权排序 | 第2完成单位 |
文献子类 | Article |
英文摘要 | We model helium-rich stars with solar metallicity (X = 0.7, Z = 0.02) progenitors that evolve to form AM Canum Venaticorum systems through a helium-star formation channel, with the aim to explain the observed properties of Gaia14aae and ZTFJ1637+49. We show that semidegenerate, H-exhausted (X <= 10(-5)), He-rich (Y approximate to 0.98) donors can be formed after a common envelope evolution (CEE) phase if either additional sources of energy are used to eject the common envelope, or a different formalism of CEE is implemented. We follow the evolution of such binary systems after the CEE phase using the Cambridge stellar evolution code when they consist of a He-star and a white dwarf accretor, and report that the mass, radius, and mass-transfer rate of the donor, the orbital period of the system, and the lack of hydrogen in the spectrum of Gaia14aae and ZTFJ1637+49 match well with our modelled trajectories wherein, after the CEE phase Roche lobe overflow is governed not only by the angular momentum loss (AML) owing to gravitational wave radiation (AML(GR)) but also an additional AML owing to alpha-omega dynamos in the donor. This additional AML is modelled with our double-dynamo (DD) model of magnetic braking in the donor star. We explain that this additional AML is just a consequence of extending the DD model from canonical cataclysmic variable donors to evolved donors. We show that none of our modelled trajectories match with Gaia14aae or ZTFJ1637+49 if the systems are modelled only with AML(GR). |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
资助项目 | Gates Cambridge Trust ; NSFC[12173081] ; key research programme of frontier sciences, CAS[ZDBS-LY-7005] ; Yunnan Fundamental Research Projects[202101AV070001] ; Churchill College |
WOS关键词 | LOW-MASS ; CATACLYSMIC VARIABLES ; ENVELOPE EJECTION ; EVOLUTION ; SPECTROSCOPY ; POPULATION ; PARAMETER ; EMISSION ; DONORS |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | OXFORD UNIV PRESS |
WOS记录号 | WOS:000910908900018 |
资助机构 | Gates Cambridge Trust ; NSFC[12173081] ; key research programme of frontier sciences, CAS[ZDBS-LY-7005] ; Yunnan Fundamental Research Projects[202101AV070001] ; Churchill College |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/25825] |
专题 | 云南天文台_大样本恒星演化研究组 |
通讯作者 | Sarkar, Arnab; Ge HW(葛宏伟); Tout, Christopher A |
作者单位 | 1.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, Kunming 650216, China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 3.Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB3 OHA, UK; |
推荐引用方式 GB/T 7714 | Sarkar, Arnab,Ge HW,Tout, Christopher A. New insights into the helium star formation channel of AM CVn systems with explanations of Gaia14aae and ZTFJ1637+49[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,519(2):2567-2577. |
APA | Sarkar, Arnab,Ge HW,&Tout, Christopher A.(2023).New insights into the helium star formation channel of AM CVn systems with explanations of Gaia14aae and ZTFJ1637+49.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,519(2),2567-2577. |
MLA | Sarkar, Arnab,et al."New insights into the helium star formation channel of AM CVn systems with explanations of Gaia14aae and ZTFJ1637+49".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 519.2(2023):2567-2577. |
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