近距离双星中剥离核心坍缩超新星的模拟

Alex Rimoldi, Simon Portegies Zwart, Elena Maria Rossi
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引用次数: 21

摘要

我们对一个紧密双星系统中氦恒星的爆炸进行了光滑粒子流体动力学模拟,并研究了爆炸对伴星的影响以及伴星的存在对超新星遗迹的影响。通过模拟超新星从核心弹跳到残余壳层经过伴星的机制,我们能够分离出导致最终系统参数的各种现象。在最后一个系统中,我们测量了伴星的质量剥离和烧蚀,以及附加的速度。我们的结果与最近的研究结果一致,表明与早期的估计相比,这些数量的值更小。然而,我们确实发现了一些差异,特别是在伴星获得的速度上,这可以用我们模拟中爆炸自然产生的不同喷射结构来解释。这些结果表明,基于外推的Type?Ia模拟应该被修改。我们还研究了超新星喷出物壳的结构。伴星的存在在膨胀的超新星遗迹中产生了一个圆锥形的空洞,伴星物质的损失导致超新星遗迹的一侧更富金属,而在空洞周围更富氢(来自伴星物质)。随着炮弹的冲击,我们检查同伴被冲击加热后的状态。
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Simulations of stripped core-collapse supernovae in close binaries

We perform smoothed-particle hydrodynamical simulations of the explosion of a helium star in a close binary system, and study the effects of the explosion on the companion star as well as the effect of the presence of the companion on the supernova remnant. By simulating the mechanism of the supernova from just after core bounce until the remnant shell passes the stellar companion, we are able to separate the various phenomena leading to the final system parameters. In the final system, we measure the mass stripping and ablation from, and the additional velocity imparted to, the companion stars. Our results agree with recent work showing smaller values for these quantities compared to earlier estimates. We do find some differences, however, particularly in the velocity gained by the companion, which can be explained by the different ejecta structure that naturally results from the explosion in our simulations. These results indicate that predictions based on extrapolated Type?Ia simulations should be revised. We also examine the structure of the supernova ejecta shell. The presence of the companion star produces a conical cavity in the expanding supernova remnant, and loss of material from the companion causes the supernova remnant to be more metal-rich on one side and more hydrogen-rich (from the companion material) around the cavity. Following the impact of the shell, we examine the state of the companion after being heated by the shock.

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期刊介绍: Computational Astrophysics and Cosmology (CompAC) is now closed and no longer accepting submissions. However, we would like to assure you that Springer will maintain an archive of all articles published in CompAC, ensuring their accessibility through SpringerLink's comprehensive search functionality.
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