A pair of CO plus He white dwarfs as the progenitor of 2005E-like supernovae?
文献类型：期刊论文
| 作者 | Meng XC(孟祥存)1,2 ; Han ZW(韩占文)1,2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2015-01 |
| 卷号 | 573 |
| ISSN号 | 0004-6361 |
| 关键词 | white dwarfs supernovae: general binaries: close |
| 通讯作者 | Meng, XC (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650216, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | Context. Ca-rich transients (CRTs, 2005E-like supernovae) exhibit unusually strong Ca features during their nebular phase, and their distribution in their host galaxies indicates that they belong to a metal-poor old population. A pair of low-mass CO + He white dwarfs (WD) has been suggested to be the progenitor of CRTs. A helium shell is accumulated onto the CO WD by accretion, and then a helium-shell detonation is ignited when the helium shell reaches a critical mass, which could lead to the second detonation in the center of the CO WD. Aims. Taking the birth rate of CRTs into consideration, we examine whether and if yes, which type of low-mass CO + He WD pairs fulfill the constraints of being of an old population and of the birth rate derived from observations. Methods. We carried out a series of binary population syntheses and present four different channels in which CO + He WD pairs can be formed. We selected the systems that fulfill the constraints of being of an old population and of the birth rate from all the CO + He WD pairs by constraining the component mass of the WD pairs. Results. For the four channels, the stable Roche lobe overflow (RLOF) could significantly influence the formation of the WD pairs. Based on their position on the M-CO-M-He plane, the mass-transfer between the components for most of the CO + He WD pairs is neither always unstable nor always stable. We found that it is necessary that the CO WDs are less massive than 0.6 M-circle dot and the He WDs are less massive than 0.25 M-circle dot if CO + He WD pairs are to fulfill the constraints of being of an old population and of the birth rate of CRTs. However, the He WD mass is lower than the ejecta mass of the CRTs derived from observations, while the total mass of the low-mass WD pairs is higher than this. Conclusions. Our results imply that the CO WDs participate in CRT explosions and at the same time, a bound remnant could be left after the CRT explosion if the low-mass WD pairs are the progenitors of CRTs. Therefore, it needs to be examined whether or not the helium detonation on a low-mass CO WD may lead to the second detonation in the center of the CO WDs, and whether or not the bound remnant is left after the thermonuclear explosion. |
| 学科主题 | Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences |
| 研究领域[WOS] | Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences |
| 关键词[WOS] | COMMON-ENVELOPE EFFICIENCY ; CLOSE BINARY EVOLUTION ; FINAL MASS RELATION ; HELIUM SHELL DETONATIONS ; IA SUPERNOVAE ; POPULATION SYNTHESIS ; EXPLOSION MODELS ; MERGER SYSTEMS ; FAINT TYPE ; AM CVN |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2015/01/aa24562-14/aa24562-14.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000346901300058 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4605]  |
| 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, 650216 Kunming, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650216 Kunming, PR China |
| 推荐引用方式 GB/T 7714 | Meng XC,Han ZW. A pair of CO plus He white dwarfs as the progenitor of 2005E-like supernovae?[J]. ASTRONOMY & ASTROPHYSICS,2015,573. |
| APA | Meng XC,&Han ZW.(2015).A pair of CO plus He white dwarfs as the progenitor of 2005E-like supernovae?.ASTRONOMY & ASTROPHYSICS,573. |
| MLA | Meng XC,et al."A pair of CO plus He white dwarfs as the progenitor of 2005E-like supernovae?".ASTRONOMY & ASTROPHYSICS 573(2015). |
入库方式： OAI收割
来源：云南天文台
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