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arXiv 1602.06356astro-ph.HEastro-ph.SR
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碳-氧-氖混合白矮星前身星的Ia型超新星爆发

Type Ia Supernova Explosions from Hybrid Carbon-Oxygen-Neon White Dwarf Progenitors

Donald E. Willcox, Dean M. Townsley, Alan C. Calder, Pavel A. Denissenkov, Falk Herwig

摘要:

最近的结果在恒星演化,预测存在的混合白矮星(WD)的C-O核心内的O-Ne壳,我们模拟热核(Ia型)超新星从这些混合的祖先。我们使用FLASH代码进行多维模拟的爆燃到爆震过渡(DDT)爆炸范例。我们的混合祖星模型是使用MESA恒星演化代码生成的,并且包括Urca过程的影响,并且我们将祖星模型映射到FLASH网格。我们进行了一系列的DDT模拟点火条件下的祖先的热和对流结构,假设多个点火点。为了将这些混合WD星的结果与以前的C-O白矮星的结果进行比较,我们构建了一组具有类似性质的C-O WD模型,并类似地模拟了一系列爆炸。我们发现,尽管每个套件内的显着变化,区分爆炸的趋势是明显的$^{56}$镍产量和喷出物的动力学特性。我们评论的可行性,这些爆炸作为源的某些类观察到的亚发光事件。

英文摘要:

Motivated by recent results in stellar evolution that predict the existence of hybrid white dwarf (WD) stars with a C-O core inside an O-Ne shell, we simulate thermonuclear (Type Ia) supernovae from these hybrid progenitors. We use the FLASH code to perform multidimensional simulations in the deflagration to detonation transition (DDT) explosion paradigm. Our hybrid progenitor models were produced with the MESA stellar evolution code and include the effects of the Urca process, and we map the progenitor model to the FLASH grid. We performed a suite of DDT simulations over a range of ignition conditions consistent with the progenitor's thermal and convective structure assuming multiple ignition points. To compare the results from these hybrid WD stars to previous results from C-O white dwarfs, we construct a set of C-O WD models with similar properties and similarly simulate a suite of explosions. We find that despite significant variability within each suite, trends distinguishing the explosions are apparent in their $^{56}$Ni yields and the kinetic properties of the ejecta. We comment on the feasibility of these explosions as the source of some classes of observed subluminous events.

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