| SOME CONSTRAINTS ON THE LOWER MASS LIMIT FOR DOUBLE-DEGENERATE PROGENITORS OF TYPE Ia SUPERNOVAE | |
Chen XF(陈雪飞)1,2 ; Jeffery, CS3,4; Zhang, X3; Han ZW(韩占文)1,2; Chen, X (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | ASTROPHYSICAL JOURNAL LETTERS
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| 2012-08-10 | |
| 卷号 | 755期号:1 |
| DOI | 10.1088/2041-8205/755/1/L9 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Binaries: Close Stars: Evolution Supernovae: General |
| 摘要 | Recent theoretical and observational studies both argue that the merging of double carbon-oxygen white dwarfs (WDs) is responsible for at least some Type Ia supernovae (SNe Ia). Previous (standard) studies of the anticipated SN birthrate from this channel have assumed that the merger process is conservative and that the primary criterion for explosion is that the merged mass exceeds the Chandrasekhar mass. Han & Webbink demonstrated that mass transfer and merger in close double WDs will in many cases be non-conservative. Pakmor et al. further suggested that the merger process should be violent in order to initiate an explosion. We have therefore investigated how the SN Ia birthrate from the double-degenerate (DD) channel is affected by these constraints. Using the binary-star population-synthesis method, we have calculated the DD SN Ia birthrate under conservative and non-conservative approximations, and including lower mass and mass-ratio limits indicated by recent smoothed-particle-hydrodynamic calculations. The predicted DD SN Ia rate is significantly reduced by all of these constraints. With dynamical mass loss alone (violent merger) the birthrate is reduced to 56% of the conservative rate. Requiring the mass ratio q > 2/3 further reduces the birthrate to 18% that of the standard assumption. An upper limit of 0.0061 SNuM, or a Galactic rate of 4.6 x 10(-4) yr(-1), might be realistic. |
| 项目资助者 | NSFC [10973036, 11173055, 11033008, 11003003] ; CAS [KJCX2-YW-T24] ; Ministry of Education [211102] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 2041-8205 |
| URL | 查看原文 |
| 归档日期 | 2012-12-18 |
| WOS记录号 | WOS:000306930700009 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | CLOSE BINARY EVOLUTION ; DELAY-TIME DISTRIBUTION ; WHITE-DWARF BINARIES ; STELLAR EVOLUTION ; MERGERS ; STAR ; CHANNEL ; RATES |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4524 |
| 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 | Chen, X (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, 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 3.Armagh Observatory, College Hill, Armagh BT61 9DG, UK 4.School of Physics, Trinity College Dublin, Dublin 2, Ireland |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Chen XF,Jeffery, CS,Zhang, X,et al. SOME CONSTRAINTS ON THE LOWER MASS LIMIT FOR DOUBLE-DEGENERATE PROGENITORS OF TYPE Ia SUPERNOVAE[J]. ASTROPHYSICAL JOURNAL LETTERS,2012,755(1). |
| APA | Chen XF,Jeffery, CS,Zhang, X,Han ZW,&Chen, X .(2012).SOME CONSTRAINTS ON THE LOWER MASS LIMIT FOR DOUBLE-DEGENERATE PROGENITORS OF TYPE Ia SUPERNOVAE.ASTROPHYSICAL JOURNAL LETTERS,755(1). |
| MLA | Chen XF,et al."SOME CONSTRAINTS ON THE LOWER MASS LIMIT FOR DOUBLE-DEGENERATE PROGENITORS OF TYPE Ia SUPERNOVAE".ASTROPHYSICAL JOURNAL LETTERS 755.1(2012). |
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| SOME CONSTRAINTS ON （616KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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