WFRF:(Wang Lifan)
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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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- 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.
- Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 906:2
- Tidskriftsartikel (refereegranskat)
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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- Li, Wenxiong
- Wang, Xiaofeng
- Bulla, Mattia
- Pan, Yen-Chen
- Wang, Lifan
- Mo, Jun
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- Zhang, Jujia
- Wu, Chengyuan
- Zhang, Jicheng
- Zhang, Tianmeng
- Xiang, Danfeng
- Lin, Han
- Sai, Hanna
- Zhang, Xinghan
- Chen, Zhihao
- Yan, Shengyu
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