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arXiv 1004.0288astro-ph.HEastro-ph.SR
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Ia型超新星喷出物对氦星双星伴星的影响

Impact of Type Ia Supernova Ejecta on a Helium-star Binary Companion

Kuo-Chuan Pan, Paul M. Ricker, Ronald E. Taam

摘要:

通过高分辨率的二维流体动力学模拟研究了Ia型超新星喷出物对氦星伴星的影响。对于一系列的氦星模型和初始的二元分离,它被发现,在相互作用中,$δM_{\rm ub}$,未结合的质量有关的初始的二元分离,$a$,由一个幂律的形式$δM_{\rm ub} \propto a^{m}$。根据氦星的质量,这个幂律指数在-3.1到-4.0之间变化。这个指数的小范围括号的值以前发现的富氢的同伴,这表明轨道分离的非束缚质量的依赖性并不强烈敏感的性质的二进制同伴。反冲速度也与初始的双星分离有关,指数在-2.7到-3.3之间,但幂律指数与先前研究中发现的富氢伴星不同。在超新星爆发前的双星系统中,超新星爆发后伴星的空间运动受其轨道速度的支配。由于超新星喷出物的通过而导致的伴星的Ni/Fe污染水平很难估计,但发现结合镍的质量上限为$\sim 5\times 10^{-4}\ M_\odot$。

英文摘要:

The impact of Type Ia supernova ejecta on a helium-star companion is investigated via high-resolution, two-dimensional hydrodynamic simulations. For a range of helium-star models and initial binary separations it is found that the mass unbound in the interaction, $δM_{\rm ub}$, is related to the initial binary separation, $a$, by a power law of the form $δM_{\rm ub} \propto a^{m}$. This power-law index is found to vary from -3.1 to -4.0, depending on the mass of the helium star. The small range of this index brackets values found previously for hydrogen-rich companions, suggesting that the dependence of the unbound mass on orbital separation is not strongly sensitive to the nature of the binary companion. The kick velocity is also related to the initial binary separation by a power law with an index in a range from -2.7 to -3.3, but the power-law index differs from those found in previous studies for hydrogen-rich companions. The space motion of the companion after the supernova is dominated by its orbital velocity in the pre-supernova binary system. The level of Ni/Fe contamination of the companion resulting from the passage of the supernova ejecta is difficult to estimate, but an upper limit on the mass of bound nickel is found to be $\sim 5\times 10^{-4}\ M_\odot$.

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