Impact of the frequency dependence of tidal Q on the evolution of planetary systems
Impact of the frequency dependence of tidal Q on the evolution of planetary systems
复制标题
潮汐 Q 的频率依赖性对行星系统演化的影响
DOI：
10.1051/0004-6361/201322782
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Mathis
中科院分区：
文献类型：
--
作者：
P. Auclair;C. L. Poncin;S. Mathis
上下文。行星和恒星中的潮汐耗散是驱动行星系统演化的关键物理机制之一。目标。潮汐耗散特性与所研究天体的内部结构和流变性有着内在的联系。在固体和流体的情况下，耗散对潮汐频率的依赖关系有很大的不同。方法。我们计算了一个两体共面系统的潮汐演变，使用潮汐质量因子的频率依赖关系，适用于岩石和对流流体。结果。随后的轨道动力学是平稳的还是极不稳定的，这取决于潮汐耗散对频率的依赖程度。结论。我们证明了内部结构和中心体的流变对潮汐摄动器的轨道演化的强烈影响。平滑的频率依赖性潮汐耗散使轨道演化平滑，而峰值耗散则使轨道行为不稳定。
Context. Tidal dissipation in planets and in stars is one of the key physical mechanisms that drive the evolution of planetary systems. Aims. Tidal dissipation properties are intrisically linked to the internal structure and the rheology of studied celestial bodies. The resulting dependence of the dissipation upon the tidal frequency is strongly di erent in the cases of solids and fluids. Methods. We compute the tidal evolution of a two-body coplanar system, using the tidal quality factor’s frequency-dependencies appropriate to rocks and to convective fluids. Results. The ensuing orbital dynamics comes out smooth or strongly erratic, dependent on how the tidal dissipation depends upon frequency. Conclusions. We demonstrate the strong impact of the internal structure and of the rheology of the central body on the orbital evolution of the tidal perturber. A smooth frequency-dependence of the tidal dissipation renders a smooth orbital evolution while a peaked dissipation can furnish erratic orbital behaviour.