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Hot Subdwarf Stars as the Donors of Type Ia Supernova Progenitors
Wang B(王博)1,2; Han ZW(韩占文)1,2
Source PublicationAstronomical Society of the Pacific (ASP) Conference Series - 6th Meeting on Hot Subdwarf Stars and Related Objects
2014-04
Volume481
Pages233-236
Author of SourceVanGrootel, V; Green, EM; Fontaine, G; Charpinet, S
Contribution Rank第1完成单位
Indexed ByCPCI
Conference Name6th Meeting on Hot Subdwarf Stars and Related Objects
Conference Date2013-05-19
Conference PlaceSteward Observatory, University of Arizona, Tucson, Arizona, USA
Conference SponsorSteward Observ; Univ Arizona Fdn
Abstract

Type Ia supernovae (SNe Ia) play an important role in astrophysics and are crucial for the studies of stellar evolution, galaxy evolution and cosmology. They are generally thought to be thermonuclear explosions of accreting carbon-oxygen white dwarfs (CO WDs) in close binaries, however, the nature of the mass donor star is still unclear. It has recently been proposed that one sub-class of SNe Ia is sufficiently both distinct and common to be classified separately from the bulk of SNe Ia, with a suggested class name of “type Iax supernovae” (SN Iax), after SN 2002cx. We show that the population properties of this class can be understood if the events originate from helium double-detonation sub-Chandrasekhar mass explosions, in which a CO WD accumulates a helium layer from a non-degenerate hot subdwarf star. We have incorporated detailed binary evolution calculations for the progenitor systems into a binary population synthesis model to obtain birthrates and delay times for such events. The predicted Galactic event rate is in good agreement with the measured rates of SNe Iax. In addition, predicted delay times are consistent with the fact that SNe Iax have so far only been discovered in late-type galaxies. Based on the CO WD mass at explosion, we also estimate the distribution of resulting SN brightness, which can reproduce the empirical diversity of SNe Iax.

Funding ProjectNSFC[11033008, 11103072] ; CAS[KJCX2-YW-T24] ; CAS (Western Light Youth Project)
Funding OrganizationNSFC ; CAS ; CAS (Western Light Youth Project)
Language英语
Subject Area天文学 ; 天体物理学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeProceedings Paper
PublisherAstronomical Society of the Pacific
Publication PlaceSan Francisco
ISBN978-1-58381-846-6
URL查看原文
Archive Date2014-09-01
WOS IDWOS:000398425600032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordStellar Evolution ; White-dwarfs ; Delay Times ; Mass ; Channel ; Binary ; Models
Citation statistics
Document Type会议论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9650
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 AuthorWang B(王博)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang B,Han ZW. Hot Subdwarf Stars as the Donors of Type Ia Supernova Progenitors[C]//VanGrootel, V; Green, EM; Fontaine, G; Charpinet, S. San Francisco:Astronomical Society of the Pacific,2014:233-236.
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