Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters
Explosive Nucleosynthesis in Sub-Chandrasekhar-mass White Dwarf Models for Type Ia Supernovae: Dependence on Model Parameters
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DOI：
10.3847/1538-4357/ab5c1f
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Leung;K. Nomoto
中科院分区：
文献类型：
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作者：
S. Leung;K. Nomoto
最近对Ia型超新星（SNe Ia）的观测显示了爆炸强度、光变曲线和化学成分的多样性。为了研究超新星Ia中这种扩散的可能起源，我们提出了一个多维的流体动力学研究爆炸和相关的核合成在近rasekhar质量的碳-氧（CO）白色矮星（WD）的参数范围很广。在本文中，我们扩展我们的宽参数调查模型的爆炸亚亚克拉塞卡质量的CO WD。爆炸机理采用双爆轰模型。调查的模型参数包括金属丰度Z = 0-5 Z，CO WD质量M = 0.90-1.20 M，He包络质量MHe = 0.05-0.20 M。我们还研究了初始He爆轰配置，如球形，气泡，和环形形状，触发C爆轰。对于这些参数，我们推导出最小的He信封质量触发C爆轰。然后，我们研究如何爆炸动力学和相关的核合成依赖于这些参数，我们比较我们的结果与以前的代表性模型。我们比较了我们的核合成产量与Fe峰元素和同位素在SNe Ia SN 2011 fe，SN 2012 cg和SN 2014 J中观察到的异常丰度模式，以及SN Ia残余3C 397，以提供对它们的祖先和环境的限制。本文给出了亚克拉塞卡质量爆炸的核合成产额表，讨论了它们在星系化学演化和考古学中的作用。
Recent observations of Type Ia supernovae (SNe Ia) have shown diversified properties of the explosion strength, light curves, and chemical composition. To investigate possible origins of such diversities in SNe Ia, we have presented multidimensional hydrodynamical studies of explosions and associated nucleosynthesis in near-Chandrasekhar-mass carbon–oxygen (CO) white dwarfs (WDs) for a wide range of parameters. In the present paper, we extend our wide parameter survey of models to the explosions of sub-Chandrasekhar-mass CO WDs. We take the double-detonation model for the explosion mechanism. The model parameters of the survey include a metallicity of Z = 0–5 Z⊙, a CO WD mass of M = 0.90–1.20 M⊙, and a He envelope mass of MHe = 0.05–0.20 M⊙. We also study how the initial He detonation configuration, such as spherical, bubble, and ring shapes, triggers the C detonation. For these parameters, we derive the minimum He envelope mass necessary to trigger the C detonation. We then examine how the explosion dynamics and associated nucleosynthesis depend on these parameters, and we compare our results with the previous representative models. We compare our nucleosynthesis yields with the unusual abundance patterns of Fe-peak elements and isotopes observed in SNe Ia SN 2011fe, SN 2012cg, and SN 2014J, as well as SN Ia remnant 3C 397, to provide constraints on their progenitors and environments. We provide the nucleosynthesis yields table of the sub-Chandrasekhar-mass explosions, to discuss their roles in the galactic chemical evolution and archaeology.