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arXiv 1706.09786astro-ph.SR
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共包线双星相互作用模拟中的binding energy效应和分辨率

The effect of binding energy and resolution in simulations of the common envelope binary interaction

Roberto Iaconi, Orsola De Marco, Jean-Claude Passy, Jan Staff

摘要:

在致密双星的演化过程中,共同的包络双星相互作用仍然是最不为人所知的阶段之一,包括那些导致Ia型超新星和合并发射可检测到的引力波的双星。在这项工作中,我们继续详细和系统的分析,三维流体动力学模拟的共同包络相互作用,旨在了解结果的可靠性。我们的第一组模拟复制了Passy等人的5个模拟(0.88Msun,90 Rsun RGB原色与0.1至0.9Msun范围内的同伴),使用我们修改版本的流体动力学代码恩佐上实现的新AMR重力求解器。尽管获得的最终分离较小,但这些更高分辨率的模拟并不改变所得出结论的性质。我们还进行了5个相同的模拟,但与帕西等人的模拟相同,核心质量为2.0Msun的RGB主星,隔离了包络结合能的影响。在一个更受束缚的包层中,所有的伴星都在更快更深的螺旋中旋转,尽管相对较少的气体是不受束缚的。即使在最高分辨率下,即使我们通过模拟考虑了一些角动量的损失,用较重的主粒子模拟获得的最终分离也与平滑势的大小相似。因此,我们认为,一个~2.0$Msun的RGB原色可能最终与质量为0.6Msun的同伴合并,这是无法使用基于能量守恒的分析参数推导出来的。

英文摘要:

The common envelope binary interaction remains one of the least understood phases in the evolution of compact binaries, including those that result in Type Ia supernovae and in mergers that emit detectable gravitational waves. In this work we continue the detailed and systematic analysis of 3D hydrodynamic simulations of the common envelope interaction aimed at understanding the reliability of the results. Our first set of simulations replicate the 5 simulations of Passy et al. (a 0.88Msun, 90Rsun RGB primary with companions in the range 0.1 to 0.9Msun) using a new AMR gravity solver implemented on our modified version of the hydrodynamic code Enzo. Despite smaller final separations obtained, these more resolved simulations do not alter the nature of the conclusions that are drawn. We also carry out 5 identical simulations but with a 2.0Msun primary RGB star with the same core mass as the Passy et al. simulations, isolating the effect of the envelope binding energy. With a more bound envelope all the companions in-spiral faster and deeper though relatively less gas is unbound. Even at the highest resolution, the final separation attained by simulations with a heavier primary is similar to the size of the smoothed potential even if we account for the loss of some angular momentum by the simulation. As a result we suggest that a ~2.0$Msun RGB primary may possibly end in a merger with companions as massive as 0.6Msun, something that would not be deduced using analytical arguments based on energy conservation.

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