标题： 双世界，分歧的命运：斜率如何不同地塑造了冥王星和海卫一的地貌与气候 显示英文标题

标题： Twin Worlds, Divergent Fates: How Obliquity has differently shaped Pluto's and Triton's landscapes and climates

摘要： 海卫一和冥王星被认为具有共同的起源，两者最初都在柯伊伯带形成，但海卫一后来被海王星捕获。这两个天体显示出相似的大小、密度以及大气和表面冰的组成，都存在挥发性冰（氮冰、甲烷冰和一氧化碳冰）。然而，它们的外观——包括表面反照率和冰的分布——却有很大的差异。是什么导致了这些不同的外观呢？ 一个明显的差异是：由于围绕海王星运行而经历显著潮汐加热的海卫一，其表面经历了重新塑造，形成了相对平坦的地表，而冥王星没有受到潮汐作用的影响，地表呈现出明显的地形特征。在这里，我们使用相同的初始条件和挥发物库存，但采用每个天体已知的轨道和自转特性，对冥王星和海卫一进行了长期挥发物输运模拟。该模型在一定程度上再现了冥王星和海卫一观测到的挥发性冰表面分布。我们的研究结果明确表明，倾角是冥王星和海卫一表面外观和气候特性差异的主要驱动力，并进一步支持了这两个天体具有共同起源但经历了不同动力学历史的假设。 显示英文摘要

摘要： Triton and Pluto are believed to share a common origin, both forming initially in the Kuiper Belt but Triton being later captured by Neptune. Both objects display similar sizes, densities, and atmospheric and surface ice composition, with the presence of volatile ices N2, CH4 and CO. Yet their appearance, including their surface albedo and ice distribution strongly differ. What can explain these different appearances? A first disparity is that Triton is experiencing significant tidal heating due to its orbit around Neptune, with subsequent resurfacing and a relatively flat surface, while Pluto is not tidally activated and displays a pronounced topography. Here we present long-term volatile transport simulations of Pluto and Triton, using the same initial conditions and volatile inventory, but with the known orbit and rotation of each object. The model reproduces, to first order, the observed volatile ice surface distribution on Pluto and Triton. Our results unambiguously demonstrate that obliquity is the main driver of the differences in surface appearance and in climate properties on Pluto and Triton, and give further support to the hypothesis that both objects had a common origin followed by a different dynamical history.