A hybrid type Ia supernova with an early flash triggered by helium-shell detonation | |
Jiang, Ji-an1,2; Doi, Mamoru1,3,4; Maeda, Keiichi3,5; Shigeyama, Toshikazu4; Nomoto, Ken'ichi3; Yasuda, Naoki3; Jha, Saurabh W.6; Tanaka, Masaomi3,7; Morokuma, Tomoki1,3; Tominaga, Nozomu3,8 | |
刊名 | NATURE |
2017-10-05 | |
卷号 | 550期号:7674页码:80-+ |
ISSN号 | 0028-0836 |
DOI | 10.1038/nature23908 |
英文摘要 | Type Ia supernovae arise from the thermonuclear explosion of white-dwarf stars that have cores of carbon and oxygen(1,2). The uniformity of their light curves makes these supernovae powerful cosmological distance indicators(3,4), but there have long been debates about exactly how their explosion is triggered and what kind of companion stars are involved(2,5,6). For example, the recent detection of the early ultraviolet pulse of a peculiar, subluminous type Ia supernova has been claimed as evidence for an interaction between a red-giant or a main-sequence companion and ejecta from a whited-warf explosion(7,8). Here we report observations of a prominent but red optical flash that appears about half a day after the explosion of a type Ia supernova. This supernova shows hybrid features of different supernova subclasses, namely a light curve that is typical of normal-brightness supernovae, but with strong titanium absorption, which is commonly seen in the spectra of subluminous ones. We argue that this early flash does not occur through previously suggested mechanisms such as the companion-ejecta interaction(8-10). Instead, our simulations show that it could occur through detonation of a thin helium shell either on a near-Chandrasekhar- mass white dwarf, or on a sub-Chandrasekhar-mass white dwarf merging with a less-massive white dwarf. Our finding provides evidence that one branch of previously proposed explosion models-the helium-ignition branch- does exist in nature, and that such a model may account for the explosions of white dwarfs in a mass range wider than previously supposed(11-14). |
WOS关键词 | DOUBLE-DEGENERATE SCENARIO ; LIGHT CURVES ; SN 2011FE ; SPECTRA ; MODELS ; PROGENITORS ; PHOTOMETRY ; EXPLOSION ; EMISSION ; BINARIES |
WOS研究方向 | Science & Technology - Other Topics |
语种 | 英语 |
出版者 | NATURE PUBLISHING GROUP |
WOS记录号 | WOS:000412214100048 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/22742] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Jiang, Ji-an |
作者单位 | 1.Univ Tokyo, Grad Sch Sci, Inst Astron, 2-21-1 Osawa, Mitaka, Tokyo 1810015, Japan 2.Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 3.Univ Tokyo, Kavli Inst Phys & Math Univ WPI, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan 4.Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 5.Kyoto Univ, Dept Astron, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan 6.Rutgers State Univ, Dept Phys & Astron, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA 7.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 8.Konan Univ, Dept Phys, Fac Sci & Engn, 8-9-1 Okamoto, Kobe, Hyogo 6588501, Japan 9.Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA 10.CSIC, Inst Fis Fundamental, Calle Serrano 121, E-28006 Madrid, Spain |
推荐引用方式 GB/T 7714 | Jiang, Ji-an,Doi, Mamoru,Maeda, Keiichi,et al. A hybrid type Ia supernova with an early flash triggered by helium-shell detonation[J]. NATURE,2017,550(7674):80-+. |
APA | Jiang, Ji-an.,Doi, Mamoru.,Maeda, Keiichi.,Shigeyama, Toshikazu.,Nomoto, Ken'ichi.,...&Miyazaki, Satoshi.(2017).A hybrid type Ia supernova with an early flash triggered by helium-shell detonation.NATURE,550(7674),80-+. |
MLA | Jiang, Ji-an,et al."A hybrid type Ia supernova with an early flash triggered by helium-shell detonation".NATURE 550.7674(2017):80-+. |
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