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Can the Helium-deto...
Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?
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- Li, Wenxiong (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.;Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel.
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- Wang, Xiaofeng (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.;Beijing Acad Sci & Technol, Beijing Planetarium, Beijing 100089, Peoples R China.;Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China.
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- Bulla, Mattia (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.,Nordiska institutet för teoretisk fysik (Nordita)
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- Pan, Yen-Chen (författare)
- Natl Cent Univ, Grad Inst Astron, 300 Jhongda Rd, Taoyuan 32001, Taiwan.
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- Wang, Lifan (författare)
- Texas A&M Univ, Dept Phys & Astron, George P & Cynthia Woods Mitchell Inst Fundamenta, 4242 TAMU, College Stn, TX 77843 USA.
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- Mo, Jun (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Zhang, Jujia (författare)
- Chinese Acad Sci, Yunnan Observ YNAO, Kunming 650216, Yunnan, Peoples R China.;Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China.
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- Wu, Chengyuan (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Zhang, Jicheng (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Zhang, Tianmeng (författare)
- Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 10101, Peoples R China.;Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China.
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- Xiang, Danfeng (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Lin, Han (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Sai, Hanna (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Zhang, Xinghan (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Chen, Zhihao (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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- Yan, Shengyu (författare)
- Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.
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Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.;Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel. Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China.;Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China.;Beijing Acad Sci & Technol, Beijing Planetarium, Beijing 100089, Peoples R China.;Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China. (creator_code:org_t)
- 2021-01-13
- 2021
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 906:2
- Relaterad länk:
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https://doi.org/10.3...
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https://iopscience.i...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- 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 lambda 6580 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Type Ia supernovae
- Observational astronomy
- Helium burning
- Optical observation
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Till lärosätets databas
- Av författaren/redakt...
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Li, Wenxiong
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Wang, Xiaofeng
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Bulla, Mattia
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Pan, Yen-Chen
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Wang, Lifan
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Mo, Jun
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Zhang, Jujia
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Wu, Chengyuan
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Zhang, Jicheng
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Zhang, Tianmeng
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Xiang, Danfeng
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Lin, Han
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Sai, Hanna
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Zhang, Xinghan
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Chen, Zhihao
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Yan, Shengyu
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