The Cold and Dusty Circumstellar Matter around Fast-expanding Type Ia Supernovae
文献类型：期刊论文
| 作者 | Wang, Xiaofeng1,2; Chen, Jia1,2; Wang, Lifan3,4 ; Hu, Maokai4; Xi, Gaobo1,2; Yang, Yi3,5; Zhao, Xulin1,2,6; Li, Wenxiong1,2
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-09-10 |
| 卷号 | 882期号:2页码:13 |
| ISSN号 | 0004-637X |
| 关键词 | binaries: symbiotic scattering stars: circumstellar matter supernovae: general |
| DOI | 10.3847/1538-4357/ab26b5 |
| 通讯作者 | Wang, Xiaofeng(wang_xf@mail.tsinghua.edu.cn) |
| 英文摘要 | SNe Ia play key roles in revealing the accelerating expansion of the universe, but our knowledge of their progenitors is still very limited. Here we report the discovery of a rigid dichotomy in circumstellar (CS) environments around two subclasses of SNe Ia as defined by their distinct photospheric velocities. For the SNe Ia with high photospheric velocities (HVs), we found a significant excess flux in blue light 60-100 days past maximum, while this phenomenon is absent for SNe with normal photospheric velocity. This blue excess can be attributed to light echoes by circumstellar dust located at a distance of about (1-2) x 10(17) cm from the HV subclass. Moreover, we also found that the HV SNe Ia show systematically evolving Na I absorption line by performing a systematic search of variable Na I absorption lines in spectra of all SNe Ia, whereas this evolution is rarely seen in normal ones. The evolving Na I absorption can be modeled in terms of photoionization model, with the location of the gas clouds at a distance of about 2 x 10(17) cm, in striking agreement with the location of CS dust inferred from B-band light-curve excess. These observations show clearly that the progenitors of HV subclass are likely from single-degenerate progenitor system (i.e., symbiotic binary), while the NV subclass may arise from double-degenerate system. |
| WOS关键词 | BVRI LIGHT CURVES ; SODIUM-ABSORPTION ; K-CORRECTIONS ; ATOMIC DATA ; LUMINOSITY ; COMPANION ; PROGENITOR ; LINES ; SPECTROSCOPY ; ASTROPHYSICS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000485673200017 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/27940]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Wang, Xiaofeng |
| 作者单位 | 1.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 2.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 3.Texas A&M Univ, Mitchell Inst Fundamental Phys & Astron, College Stn, TX 77843 USA 4.Purple Mt Observ, Nanjing 201008, Jiangsu, Peoples R China 5.Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel 6.Tianjin Univ Technol, Dept Phys, Tianjin 300384, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiaofeng,Chen, Jia,Wang, Lifan,et al. The Cold and Dusty Circumstellar Matter around Fast-expanding Type Ia Supernovae[J]. ASTROPHYSICAL JOURNAL,2019,882(2):13. |
| APA | Wang, Xiaofeng.,Chen, Jia.,Wang, Lifan.,Hu, Maokai.,Xi, Gaobo.,...&Li, Wenxiong.(2019).The Cold and Dusty Circumstellar Matter around Fast-expanding Type Ia Supernovae.ASTROPHYSICAL JOURNAL,882(2),13. |
| MLA | Wang, Xiaofeng,et al."The Cold and Dusty Circumstellar Matter around Fast-expanding Type Ia Supernovae".ASTROPHYSICAL JOURNAL 882.2(2019):13. |
入库方式： OAI收割
来源：紫金山天文台
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