Type Ia Supernova Models and Progenitor Scenarios
Type Ia Supernova Models and Progenitor Scenarios
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DOI：
10.1017/s1743921312015165
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
K. Nomoto;Y. Kamiya;N. Nakasato
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文献类型：
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作者：
K. Nomoto;Y. Kamiya;N. Nakasato
本文综述了Ia型超新星前驱系统(SNE Ia)与爆炸机制之间关系的理论研究进展。(1)DD-subCH：在双C+O白矮星合并(DD情景)中，如果在早期动力学阶段在白矮星(WD)表面附近诱发碳爆炸，则可能导致(有效的)亚Chandrasekhar质量爆炸。(2)DD-CH：如果不点燃表面C爆轰，WD可以增长到Chandrasekhar质量，但结果取决于静止的碳壳燃烧是否被点燃并将C+O燃烧成O+Ne+Mg。(3)SD-SubCH：在单一简并(SD)情形下，如果He壳层闪光变强以引发He爆炸，则会导致亚Chandra爆炸。(4)SD-CH：如果He壳层闪光不够强，在爆炸前，它们仍在C+O WD表面附近产生大量有趣的Si和S。在钱德拉大爆炸中，中心密度高到足以产生电子俘获元素，例如稳定的58Ni。对星云光谱中镍的发射线的观测为亚钱德拉和钱德拉问题提供了有用的诊断。最近在SNE Ia表面附近观测到的相对低速碳也为爆炸模型提供了一个有趣的约束。
Abstract We review some recent developments in theoretical studies on the connection between the progenitor systems of Type Ia supernovae (SNe Ia) and the explosion mechanisms. (1) DD-subCh: In the merging of double C+O white dwarfs (DD scenario), if the carbon detonation is induced near the white dwarf (WD) surface in the early dynamical phase, it could result in the (effectively) sub-Chandrasekhar mass explosion. (2) DD-Ch: If no surface C-detonation is ignited, the WD could grow until the Chandrasekhar mass is reached, but the outcome depends on whether the quiescent carbon shell burning is ignited and burns C+O into O+Ne+Mg. (3) SD-subCh: In the single degenerate (SD) scenario, if the He shell-flashes grow strong to induce a He detonation, it leads to the sub-Chandra explosion. (4) SD-Ch: If the He-shell flashes are not strong enough, they still produce interesting amounts of Si and S near the surface of the C+O WD before the explosion. In the Chandra mass explosion, the central density is high enough to produce electron capture elements, e.g., stable 58Ni. Observations of the emission lines of Ni in the nebular spectra provides useful diagnostics of the sub-Chandra vs. Chandra issue. The recent observations of relatively low velocity carbon near the surface of SNe Ia provide also an interesting constraint on the explosion models.