Accreting carbon-oxygen white dwarfs at explosive C ignition
文献类型：期刊论文
| 作者 | Chen XF(陈雪飞)1,2 ; Han ZW(韩占文)1,2; Meng XC(孟祥存)3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2014-03 |
| 卷号 | 438期号:4页码:3358-3367 |
| ISSN号 | 0035-8711 |
| 关键词 | stars: evolution supernovae: general white dwarfs |
| 通讯作者 | Chen, XF (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | The conditions at which an accreting carbon-oxygen white dwarf (CO WD) ignites C explosively have been considered to be possibly responsible for the maximum luminosity of Type Ia supernovae (SNe Ia). However, the exact conditions for this explosion have been in controversy. Employing the latest powerful stellar evolution code, Modules for Experiments in Stellar Astrophysics, and the descriptions of the single-degenerate (SD) model for progenitors of SNe Ia, we studied the evolution of several Pop I CO WDs from the onset of mass accretion to the explosive C ignition, where the temperature increases sharply but the density keeps in constant at the maximum temperature point (T-max) of the accreting CO WD. The accreted material is CO-rich and we include two sets of calculations, i.e. one is for a simple accretion like in Lesaffre et al. (2006) while the other artificially adds an energy generation rate (1 x 10(5) erg g(-1) s(-1)) in the outermost 0.005 M-circle dot material during accretion to mimic the energy delivered inwards from H- and He-burning. Both simulations show that most CO WDs ignite C explosively (at the T-max) in the centre, with very similar properties such as WD masses (similar to 1.387 M-circle dot), central densities (similar to 2.63 x 10(9) g cm(-3)), central temperatures(similar to 10(9) K) and binding energies (similar to 5.23 x 10(50) erg). This means that most SNe Ia are ignited initially in the centre of CO WDs based on the SD model. However, the central density and WD mass have been influenced by the initial C/O ratio at the centre of CO WDs. A few initially very cold massive CO WDs ignite C at off-centre points but still in the deep interior of WDs. In these explosions, the offset distance to the centre, the WD mass and central density at the explosion clearly increase with the cooling age, while the inclusion of an extra energy source resists this increasing in part. The off-centre explosions can only occasionally happen in relatively old galaxies and could partly contribute to the diversity of SNe Ia. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DELAYED-DETONATION MODELS ; I SUPER-NOVAE ; LIGHT CURVES ; THERMONUCLEAR SUPERNOVAE ; CENTRAL DENSITY ; HOST GALAXIES ; PROGENITORS ; EVOLUTION ; CHANNEL ; STAR |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/438/4/3358 |
| 语种 | 英语 |
| WOS记录号 | WOS:000332038000051 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4582]  |
| 专题 | 云南天文台_大样本恒星演化研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.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 3.School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454000, China |
| 推荐引用方式 GB/T 7714 | Chen XF,Han ZW,Meng XC. Accreting carbon-oxygen white dwarfs at explosive C ignition[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,438(4):3358-3367. |
| APA | Chen XF,Han ZW,&Meng XC.(2014).Accreting carbon-oxygen white dwarfs at explosive C ignition.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,438(4),3358-3367. |
| MLA | Chen XF,et al."Accreting carbon-oxygen white dwarfs at explosive C ignition".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 438.4(2014):3358-3367. |
入库方式： OAI收割
来源：云南天文台
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