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arXiv 2004.01109astro-ph.EP
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卫星和行星的潮汐摩擦。新版本的潜潮理论

Tidal friction in satellites and planets. The new version of the creep tide theory

Sylvio Ferraz-Mello, Cristian Beaugé, Hugo Alberto Folonier, Gabriel Oliveira Gomes

摘要:

关于潜潮理论及其在卫星和行星上的应用的论文,重点是一套新的微分方程,使数值研究更容易。蠕动潮理论是一种新的理论范式,它不预先确定物体的潮汐变形,而是将物体的潮汐变形视为低雷诺数流动。在潮汐力作用下的演化由纳维-斯托克斯方程的近似解决定,该近似解取决于物体的粘性,而没有关于其形状和方向的特别假设。在气态行星和恒星的情况下,它近似地再现了达尔文理论的结果,但在刚性卫星和行星的情况下,结果完全不同。它解释了土卫二和土卫一的潮汐耗散。扩展的理论,以非均匀的冰卫星与地下海洋允许的振幅的强迫振荡同步(振动),以更好地确定。

英文摘要:

Paper on the creep tide theory and its applications to satellites and planets with emphasis on a new set of differential equations allowing easier numerical studies. The creep tide theory is a new paradigm that does not fix a priori the tidal deformation of the body, but considers the deformation as a low-Reynolds-number flow. The evolution under tidal forces is ruled by an approximate solution of the Navier-Stokes equation depending on the body's viscosity with no ad hoc assumptions on its shape and orientation. It reproduces closely the results of Darwinian theories in the case of gaseous planets and stars, but the results are completely different in the case of stiff satellites and planets. It explains the tidal dissipations of Enceladus and Mimas. The extension of the theory to nonhomogeneous icy satellites with a subsurface ocean allows the amplitude of the forced oscillations around synchronization (librations) to be better determined.

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