泰坦内部的新见解，从它的平行性
New insights on Titan's interior from its obliquity
摘要：
我们构建了一个6自由度的土卫六旋转模型作为一个3层的身体组成的一个刚性的核心，一个流体的全球海洋，和一个浮动的冰壳。冰壳表现出部分补偿的横向厚度变化，以同时匹配所观察到的度2重力和形状系数。旋转动力学受到土星引力力矩、内核与壳层之间的引力耦合以及流固边界处的压力耦合的影响。在我们的模型泰坦中，有10%到13%具有与观测值一致的周期性（由于与29.5年周期性年强迫的共振）。成功模型的外壳平均厚度为130至140公里，海洋厚度约为250公里。我们的模拟的质量演化表明，卡西尼质量测量是一个瞬时的，并不代表一个平均值。未来对时间导数的测量将有助于改进内部模型。我们特别期望在卡西尼号任务期间大约有7弧分的变化。
英文摘要：
We constructed a 6-degrees of freedom rotational model of Titan as a 3-layer body consisting of a rigid core, a fluid global ocean, and a floating ice shell. The ice shell exhibits partially-compensated lateral thickness variations in order to simultaneously match the observed degree-two gravity and shape coefficients. The rotational dynamics are affected by the gravitational torque of Saturn, the gravitational coupling between the inner core and the shell, and the pressure coupling at the fluid-solid boundaries. Between 10 and 13% of our model Titans have an obliquity (due to a resonance with the 29.5-year periodic annual forcing) that is consistent with the observed value. The shells of the successful models have a mean thickness of 130 to 140 km, and an ocean of ~250 km thickness. Our simulations of the obliquity evolution show that the Cassini obliquity measurement is an instantaneous one, and does not represent a mean value. Future measurements of the time derivative of the obliquity would help to refine the interior models. We expect in particular a variation of roughly 7 arcmin over the duration of the Cassini mission.
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