Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?
Li,Wenxiong1,2; Wang,Xiaofeng1,3,4; Bulla,Mattia5; Pan,Yen-Chen6; Wang,Lifan7; Mo,Jun1; Zhang,Jujia8,9; Wu,Chengyuan1; Zhang,Jicheng1; Zhang,Tianmeng10,11; Xiang,Danfeng1; Lin,Han1; Sai,Hanna1; Zhang,Xinghan1; Chen,Zhihao1; Yan,Shengyu1
Source PublicationThe Astrophysical Journal
AbstractAbstract We study a sample of 16 Type Ia supernovae (SNe Ia) having both spectroscopic and photometric observations within 2–3 days after the first light. The early B???V colors of such a sample tend to show a continuous distribution. For objects with normal ejecta velocity (NV), the C?ii λ6580 feature is always visible in the early spectra, while it is absent or very weak in the high-velocity (HV) counterpart. Moreover, the velocities of the detached high-velocity features (HVFs) of the Ca?II near-IR triplet (CaIR3) above the photosphere are found to be much higher in HV objects than in NV objects, with typical values exceeding 30,000 km s?1 at 2–3 days. We further analyze the relation between the velocity shift of late-time [Fe II] lines (v[Fe II]) and host galaxy mass. We find that all HV objects have redshifted v[Fe II], while NV objects have both blue- and redshifted v[Fe II]. It is interesting to point out that the objects with redshifted v[Fe II] are all located in massive galaxies, implying that HV and a portion of NV objects may have similar progenitor metallicities and explosion mechanisms. We propose that, with a geometric/projected effect, the He-detonation model may account for the similarity in birthplace environment and the differences seen in some SNe Ia, including B???V colors, C?II features, CaIR3 HVFs at early times, and v[Fe II] in the nebular phase. Nevertheless, some features predicted by He-detonation simulation, such as the rapidly decreasing light curve, deviate from the observations, and some NV objects with blueshifted nebular v[Fe II] may involve other explosion mechanisms.
KeywordType Ia supernovae Observational astronomy Helium burning Optical observation
WOS IDIOP:0004-637X-906-2-abc9b5
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorLi,Wenxiong
Affiliation1.Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing, 100084, People’s Republic of China;,
2.The School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel
3.Beijing Planetarium, Beijing Academy of Science and Technology, Beijing, 100089, People’s Republic of China
4.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210023, People’s Republic of China
5.Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
6.Graduate Institute of Astronomy, National Central University, 300 Jhongda Road, Zhongli, Taoyuan, 32001, Taiwan
7.George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, Texas A&M University, Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843, USA
8.Yunnan Observatories (YNAO), Chinese Academy of Sciences (CAS), Kunming, 650216, People’s Republic of China
9.Key Laboratory for the Structure and Evolution of Celestial Objects,CAS, Kunming, 650216, People’s Republic of China
10.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 10101, Beijing, People’s Republic of China
11.School of Astronomy and Space Science, University of Chinese Academy of Sciences, 101408, Beijing, People’s Republic of China
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Li,Wenxiong,Wang,Xiaofeng,Bulla,Mattia,et al. Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?[J]. The Astrophysical Journal,2021,906(2).
APA Li,Wenxiong.,Wang,Xiaofeng.,Bulla,Mattia.,Pan,Yen-Chen.,Wang,Lifan.,...&Yan,Shengyu.(2021).Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?.The Astrophysical Journal,906(2).
MLA Li,Wenxiong,et al."Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?".The Astrophysical Journal 906.2(2021).
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