论文标题
电路光盘中的强制偏心率
Forced Eccentricity in Circumbinary Discs
论文作者
论文摘要
我们分析了低质量共面向环盘对由开普勒怪异轨道中央二元强迫强迫的世俗潮汐的偏心响应。椎间盘获得强制偏心率，其大小取决于二进制和圆盘的特性。最大的偏心率发生在圆盘中有全球APSIDAL共振时。二进制的驾驶频率是其Apsidal频率等于零。当光盘属性允许存在零APSidal频率的偏心模式时，就会发生全局共振。径向节点数量不同的不同自由偏心模式发生共振。对于没有共振的光盘，偏心分布的形式与在共振下的磁盘分布的形式有些相似，后者的磁盘分布最接近匹配的圆盘纵横比。对于较高的圆盘纵横比，2D光盘中的强制偏心分布与基本自由模式相似。 3D光盘中的强制偏心分布类似于较高级别的免费模式，而不是基本模式，除非光盘非常酷。对于接近共振的参数，在锁定相位的二进制偏心率和二进制偏心率之间发生了较大的相移。强迫偏心率可能在电路盘及其中心二进制物的演变中起重要作用。
We analyze the eccentric response of a low mass coplanar circumbinary disc to secular tidal forcing by a Keplerian eccentric orbit central binary. The disc acquires a forced eccentricity whose magnitude depends on the properties of the binary and disc. The largest eccentricities occur when there is a global apsidal resonance in the disc. The driving frequency by the binary is its apsidal frequency that is equal to zero. A global resonance occurs when the disc properties permit the existence of a zero apsidal frequency free eccentric mode. Resonances occur for different free eccentric modes that differ in the number of radial nodes. For a disc not at resonance, the eccentricity distribution has somewhat similar form to the eccentricity distributions in discs at resonance that have the closest matching disc aspect ratios. For higher disc aspect ratios, the forced eccentricity distribution in a 2D disc is similar to that of the fundamental free mode. The forced eccentricity distribution in a 3D disc is similar to that of higher order free modes, not the fundamental mode, unless the disc is very cool. For parameters close to resonance, large phase shifts occur between the disc and binary eccentricities that are locked in phase. Forced eccentricity may play an important role in the evolution of circumbinary discs and their central binaries.
