论文标题
倾斜度阻尼在Callisto上
Inclination damping on Callisto
论文作者
论文摘要
卡利斯托（Callisto）被认为具有地下海洋，该海洋将由于倾斜潮流而消散能量。这种耗散应抑制1 GYR内的任何原始倾向 - 但Callisto保留了当今的倾向。我们认为，卡利斯托的倾向和偏心态在最近的过去（〜0.3 Gyr）都很兴奋。这种激发发生在Callisto根据“共振锁定”模型向外迁移，并通过Ganymede的2：1平均动作共振。同一事件同样，Ganymede的轨道元素也很激动。为了解释当今的轨道元素，我们推断出Callisto的固体潮汐K2/Q〜0.05，而Ganymede的值明显较低。
Callisto is thought to possess a subsurface ocean, which will dissipate energy due to obliquity tides. This dissipation should have damped any primordial inclination within 1 Gyr - and yet Callisto retains a present-day inclination. We argue that Callisto's inclination and eccentricity were both excited in the relatively recent past (~0.3 Gyr). This excitation occurred as Callisto migrated outwards according to the "resonance-locking" model and passed through a 2:1 mean-motion resonance with Ganymede. Ganymede's orbital elements were likewise excited by the same event. To explain the present-day orbital elements we deduce a solid-body tidal k2/Q~0.05 for Callisto and a significantly lower value for Ganymede.
