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arXiv 0911.3540astro-ph.HE
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快速旋转白矮星的热核爆炸- I。爆燃

Thermonuclear explosions of rapidly rotating white dwarfs - I. Deflagrations

J. M. M. Pfannes, J. C. Niemeyer, W. Schmidt, C. Klingenberg

摘要:

背景:克拉塞卡质量的白矮星的湍流爆燃通常被用来模拟Ia型超新星爆炸。在这种背景下,祖先恒星的快速旋转是合理的,但迄今为止一直被忽视。目的:这项工作的目的是探讨快速旋转对爆燃场景的影响。研究方法:我们使用三维流体动力学模拟湍流爆燃点燃内的各种快速旋转的CO WD遵守吸积研究所建议的旋转规律。结果:我们发现旋转对爆炸有显著的影响。火焰发展出强烈的各向异性,倾向于朝向恒星两极,沿着赤道平面留下大量未燃烧的物质。结论:大量未燃烧的物质与Ia超新星的光谱特征相反。因此,为了解释Ia型超新星,母星的快速自转和爆燃的假设是不相容的。

英文摘要:

Context: Turbulent deflagrations of Chandrasekhar mass White Dwarfs are commonly used to model Type Ia Supernova explosions. In this context, rapid rotation of the progenitor star is plausible but has so far been neglected. Aims: The aim of this work is to explore the influence of rapid rotation on the deflagration scenario. Methods: We use three dimensional hydrodynamical simulations to model turbulent deflagrations ignited within a variety of rapidly rotating CO WDs obeying rotation laws suggested by accretion studies. Results: We find that rotation has a significant impact on the explosion. The flame develops a strong anisotropy with a preferred direction towards the stellar poles, leaving great amounts of unburnt matter along the equatorial plane. Conclusions: The large amount of unburnt matter is contrary to observed spectral features of SNe Ia. Thus, rapid rotation of the progenitor star and the deflagration scenario are incompatible in order to explain SNe Ia.

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