Long-lived Eccentric Modes in Circumbinary Disks
Long-lived Eccentric Modes in Circumbinary Disks
复制标题
圆盘中的长寿命偏心模式
DOI：
--
复制
发表时间：
2020
影响因子：
4.9
通讯作者：
Y. Lithwick
中科院分区：
文献类型：
--
作者：
D. Muñoz;Y. Lithwick
流体动力学模拟表明，即使双星是圆形的，环双星盘也会变得偏心。在这里，我们证明，在稳定状态下，磁盘的偏心率行为作为一个长寿的自由模式捕获的转折点，自然产生的连续截断的密度分布。因此，圆盘的进动率和偏心率轮廓都可以通过扰动压力支承圆盘的简单线性理论计算。通过制定和求解线性理论，我们发现：（i）令人惊讶的是，岁差率大致由双星的四极决定，即使四极相对于压力非常弱;（ii）偏心率轮廓在靠近盘的内边缘处最大，并且呈指数级向外下降;（iii）线性理论的结果确实与模拟中发现的一致。福尔斯。了解环双星盘中偏心模式的发展是了解双星和气体之间偏心率、角动量和质量的长期（长期）交换的关键第一步。潜在的应用包括在候选双星周围的盘中寻找特征运动学签名和长时间尺度上的进动引起的吸积调制。
Hydrodynamical simulations show that circumbinary disks become eccentric, even when the binary is circular. Here we demonstrate that, in steady state, the disk’s eccentricity behaves as a long-lived free mode trapped by turning points that naturally arise from a continuously truncated density profile. Consequently, both the disk’s precession rate and eccentricity profile may be calculated via the simple linear theory for perturbed pressure-supported disks. By formulating and solving the linear theory, we find that (i) surprisingly, the precession rate is roughly determined by the binary’s quadrupole, even when the quadrupole is very weak relative to pressure; (ii) the eccentricity profile is largest near the inner edge of the disk and falls exponentially outward; and (iii) the results from linear theory indeed agree with what is found in simulations. Understanding the development of eccentric modes in circumbinary disks is a crucial first step for understanding the long-term (secular) exchange of eccentricity, angular momentum, and mass between the binary and the gas. Potential applications include the search for a characteristic kinematic signature in disks around candidate binaries and precession-induced modulation of accretion over long timescales.
圆盘：吸积和扭矩作为质量比和圆盘粘度的函数
DOI：
10.3847/1538-4357/abab95
发表时间：
2020
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Duffell, Paul C.;D’Orazio, Daniel;Derdzinski, Andrea;Haiman, Zoltan;MacFadyen, Andrew;Rosen, Anna L.;Zrake, Jonathan
通讯作者：
Zrake, Jonathan
双星在薄吸积盘中的气体驱动吸入
DOI：
10.3847/1538-4357/aba432
发表时间：
2020
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Tiede, Christopher;Zrake, Jonathan;MacFadyen, Andrew;Haiman, Zoltan
通讯作者：
Haiman, Zoltan