论文标题
夏隆：潮汐的简短历史
Charon: A brief history of tides
论文作者
论文摘要
2015年，新的视野航天器飞越冥王星及其月亮夏隆（Charon），这是夏隆（Charon）表面的首次清晰。 New Horizons图像显示了一个古老的表面，一个大型，复杂的峡谷系统以及许多裂缝等地地质特征。在这里，我们评估潮汐应力是否在夏隆的拉伸骨折形成中起重要作用。尽管目前处于圆形轨道上，但大多数夏隆轨道演变的情况都包括一段时间内的怪异轨道，甚至可能是内部海洋。过去的工作表明，这些条件可能会产生与其他潮汐破裂的卫星相当的应力，例如欧罗巴和土卫。但是，我们发现观察到的断裂方向与由于偏心驱动的潮汐应力而形成的裂缝方向之间没有相关性。因此，夏隆在海洋冻结之前循环的轨道似乎更有可能，并且单独的潮汐应力不足以裂缝表面，或者随后重新铺面消除了这些古老的裂缝。
In 2015, the New Horizons spacecraft flew past Pluto and its moon Charon, providing the first clear look at the surface of Charon. New Horizons images revealed an ancient surface, a large, intricate canyon system, and many fractures, among other geologic features. Here, we assess whether tidal stresses played a significant role in the formation of tensile fractures on Charon. Although presently in a circular orbit, most scenarios for the orbital evolution of Charon include an eccentric orbit for some period of time and possibly an internal ocean. Past work has shown that these conditions could have generated stresses comparable in magnitude to other tidally fractured moons, such as Europa and Enceladus. However, we find no correlation between observed fracture orientations and those predicted to form due to eccentricity-driven tidal stress. It thus seems more likely that the orbit of Charon circularized before its ocean froze, and that either tidal stresses alone were insufficient to fracture the surface or subsequent resurfacing remove these ancient fractures.
