论文标题

潮汐波在偏心的介质中破裂和公共包膜阶段

Tidal Wave Breaking in the Eccentric Lead-In to Mass Transfer and Common Envelope Phases

论文作者

MacLeod, Morgan, Vick, Michelle, Loeb, Abraham

论文摘要

许多近距离二进制和多个星系的演变由质量交换和相互作用的阶段定义。随着这些系统的发展,潮汐耗散并不总是足以将它们带入圆形同步轨道。在这些情况下,在轨道保持偏心的同时,发生了增强强度的相遇。本文重点介绍了怪异轨道上近潮汐的结果。关闭偏心通道激发了有关恒星平衡构型的动力学振荡。这些潮气振荡来自将轨道能将转移到振荡模式能量中。当这些振荡达到足够的幅度时,它们会在恒星表面附近断裂。地面波浪层形成围绕物体的冲击加热气氛。恒星内部发射冲击中的持续振荡散发到了这种大气中,从而抑制了潮汐振荡。我们表明,与基本振荡模式的波浪破裂相关的快速,非线性耗散,因此伴随着质量损失与波浪破裂大气相关。质量比是定义质量损失和能量消散的相对重要性的重要特征,因此决定了在非线性耗散影响下发展的系统的命运。结果可以是快速的潮汐循环($ q \ ll1 $)或失控的群众交换($ q \ gg1 $)。

The evolution of many close binary and multiple star systems is defined by phases of mass exchange and interaction. As these systems evolve into contact, tidal dissipation is not always sufficient to bring them into circular, synchronous orbits. In these cases, encounters of increasing strength occur while the orbit remains eccentric. This paper focuses on the outcomes of close tidal passages in eccentric orbits. Close eccentric passages excite dynamical oscillations about the stars' equilibrium configurations. These tidal oscillations arise from the transfer of orbital energy into oscillation mode energy. When these oscillations reach sufficient amplitude, they break near the stellar surface. The surface wave-breaking layer forms a shock-heated atmosphere that surrounds the object. The continuing oscillations in the star's interior launch shocks that dissipate into the this atmosphere, damping the tidal oscillations. We show that the rapid, nonlinear dissipation associated with the wave breaking of fundamental oscillation modes therefore comes with coupled mass loss to the wave breaking atmosphere. The mass ratio is an important characteristic that defines the relative importance of mass loss and energy dissipation and therefore determines the fate of systems evolving under the influence of nonlinear dissipation. The outcome can be rapid tidal circularization ($q\ll1$) or runaway mass exchange ($q\gg1$).

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源