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arXiv 1503.05561astro-ph.HE
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环周双星吸积盘-2的三维MHD模拟。净增长率

Three Dimensional MHD Simulation of Circumbinary Accretion Disks -2. Net Accretion Rate

Ji-Ming Shi, Julian H. Krolik

摘要:

当一个吸积盘围绕着一个以相同方向旋转的双星时,双星会对气体施加很强的转矩。一维近似的分析工作表明,这些扭矩急剧减少,甚至消除吸积盘上的二进制。然而,最近的2D和3D模拟工作已经显示出最适度的减少。我们提出了新的MHD模拟表明,对于质量比为1和0.1的双星,在大半径的吸积率在磁盘上的二进制和吸积率之间基本上没有区别。为了解决与早期的分析估计的差异,我们确定了一小部分的气体轨迹从磁盘的内边缘的二进制和显示如何充分吸积率集中到他们。

英文摘要:

When an accretion disk surrounds a binary rotating in the same sense, the binary exerts strong torques on the gas. Analytic work in the 1D approximation indicated that these torques sharply diminish or even eliminate accretion from the disk onto the binary. However, recent 2D and 3D simulational work has shown at most modest diminution. We present new MHD simulations demonstrating that for binaries with mass ratios of 1 and 0.1 there is essentially no difference between the accretion rate at large radius in the disk and the accretion rate onto the binary. To resolve the discrepancy with earlier analytic estimates, we identify the small subset of gas trajectories traveling from the inner edge of the disk to the binary and show how the full accretion rate is concentrated onto them.

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