Distribution of 56Ni Yields of Type Ia Supernovae and its Implication for Progenitors
文献类型：期刊论文
| 作者 | Bo Wang1 ; XiangCun Meng1; XiaoFeng Wang2; ZhanWen Han1
|
| 刊名 | Chinese Astronomy and Astrophysics
 |
| 出版日期 | 2008 |
| 卷号 | 8期号:1页码:71 |
| 关键词 | stars evolution - supernovae general - white dwarfs |
| ISSN号 | 0275-1062 |
| 英文摘要 | The amount of 56Ni produced in Type Ia supernova (SN Ia) explosion is probably the most important physical parameter underlying the observed correlation of SN Ia lumi-nosities with their light curves. Based on an empirical relation between the 56Ni mass and the light curve parameter △m15, we obtained rough estimates of the 56Ni mass for a large sample of nearby SNe Ia with the aim of exploring the diversity in SN Ia. We found that the derived 56Ni masses for different SNe Ia could vary by a factor of ten (e.g., MNi = 0.1 - 1.3 M⊙),which cannot be explained in terms of the standard Chandraseldaar-mass model (with a 56Ni mass production of 0.4 - 0.8 M⊙). Different explosion and/or progenitor models are clearly required for various SNe Ia, in particular, for those extremely nickel-poor and nickel-rich producers. The nickel-rich (with MNi 0.8 M⊙) SNe Ia are very luminous and may have massive progenitors exceeding the Chandrasekhar-mass limit since extra progenitor fuel is required to produce more 56Ni to power the light curve. This is also consistent with the find-ing that the intrinsically bright SNe Ia prefer to occur in stellar environments of young and massive stars. For example, 75% SNe Ia in spirals have △m15 < 1.2 while this ratio is only 18% in E/S0 galaxies. The nickel-poor SNe Ia (with MNi < 0.2 M⊙) may invoke the sub-Chandrasekhar model, as most of them were found in early-type E/S0 galaxies dominated by the older and low-mass stellar populations. This indicates that SNe Ia in spiral and E/S0 galaxies have progenitors of different properties. |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58138]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.清华大学 |
| 推荐引用方式 GB/T 7714 | Bo Wang,XiangCun Meng,XiaoFeng Wang,et al. Distribution of 56Ni Yields of Type Ia Supernovae and its Implication for Progenitors[J]. Chinese Astronomy and Astrophysics,2008,8(1):71. |
| APA | Bo Wang,XiangCun Meng,XiaoFeng Wang,&ZhanWen Han.(2008).Distribution of 56Ni Yields of Type Ia Supernovae and its Implication for Progenitors.Chinese Astronomy and Astrophysics,8(1),71. |
| MLA | Bo Wang,et al."Distribution of 56Ni Yields of Type Ia Supernovae and its Implication for Progenitors".Chinese Astronomy and Astrophysics 8.1(2008):71. |
入库方式： OAI收割
来源：国家天文台
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