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; Ivezic, Zeljko9; Ruiz-Lapuente, Pilar10,11; Stritzinger, Maximilian D.12; Mazzali, Paolo A.13,14; Ashall, Christopher13; Mould, Jeremy15; Baade, Dietrich16; Suzuki, Nao3; Connolly, Andrew J.9; Patat, Ferdinando16; Wang, Lifan17,18; Yoachim, Peter9; Jones, David19,20; Furusawa, Hisanori7; Miyazaki, Satoshi7,21
Source PublicationNATURE

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).

Indexed BySCI
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000412214100048
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorJiang, Ji-an
Affiliation1.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
11.Inst Ciencies Cosmos UB IEEC, Calle Marti & Franques 1, E-08028 Barcelona, Spain
12.Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
13.Liverpool John Moores Univ, Astrophys Res Inst, IC2 Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
14.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany
15.Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
16.European Org Astron Res Southern Hemisphere ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany
17.Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA
18.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
19.Inst Astrofis Canarias, E-38205 Tenerife, Spain
20.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
21.SOKENDAI, Mitaka, Tokyo 1818588, Japan
Recommended Citation
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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