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arXiv 1010.2242astro-ph.SR
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Ia型超新星喷出物对伴星的影响

The Impact of Type Ia Supernova Ejecta on Binary Companions

P. M. Ricker, K. -C. Pan, R. E. Taam

摘要:

我们提出了自适应网格细化(AMR)流体动力学模拟的Ia型超新星和它们的伴星之间的相互作用的背景下的单简并模型。没有二元演化的3D红巨星同伴的结果与Marietta等人先前的2D结果一致。我们还考虑了演化的氦星同伴在2D中。对于一系列的氦星质量和初始的二进制分离,我们检查的质量不受约束的相互作用和踢速度传递到伴星。我们发现,未结合的质量与分离服从指数-3.1和-4.0之间的幂律,与以前的结果为富氢的同伴。反冲速度也服从幂律关系与二进制分离,但斜率不同于那些发现富氢的同伴。假设吸积通过罗氏瓣溢出,我们发现,未结合的氦质量是符合观测极限。烧蚀(冲击加热)似乎是更重要的去除气体从氦星的同伴比从富氢的,虽然剥离(动量转移)占主导地位,在这两种情况下。

英文摘要:

We present adaptive mesh refinement (AMR) hydrodynamical simulations of the interaction between Type Ia supernovae and their companion stars within the context of the single-degenerate model. Results for 3D red-giant companions without binary evolution agree with previous 2D results by Marietta et al. We also consider evolved helium-star companions in 2D. For a range of helium-star masses and initial binary separations, we examine the mass unbound by the interaction and the kick velocity delivered to the companion star. We find that unbound mass versus separation obeys a power law with index between -3.1 and -4.0, consistent with previous results for hydrogen-rich companions. Kick velocity also obeys a power-law relationship with binary separation, but the slope differs from those found for hydrogen-rich companions. Assuming accretion via Roche-lobe overflow, we find that the unbound helium mass is consistent with observational limits. Ablation (shock heating) appears to be more important in removing gas from helium-star companions than from hydrogen-rich ones, though stripping (momentum transfer) dominates in both cases.

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