论文标题
关于平均偏心轨道：对彗星的长期热演化的影响
On averaging eccentric orbits: Implications for the long-term thermal evolution of comets
论文作者
论文摘要
长期进化研究的常见近似值之一是使用平均偏心偏心的圆形轨道，从而促进了与轨道变化和热处理等极度不同的过程的耦合。在这里，我们在彗星的长期演变中测试了许多平均椭圆轨道的方案，旨在确定最能重现椭圆轨道的加热模式以及表面和地下温度分布的方案。我们在椭圆形及其等效平均圆轨道上使用的简化热演化模型，在与内部太阳系相关的一系列轨道参数空间中。我们发现，时间平均方案比空间平均速度更为足够。通过平均温度的时间平均值产生的圆形轨道有效地近似于椭圆形轨道在轨道参数空间的大面积中的地下温度分布，从而使它们成为平均椭圆形轨道的强大工具。
One of the common approximations in long-term evolution studies of small bodies is the use of circular orbits averaging the actual eccentric ones, facilitating the coupling of processes with very different timescales, such as the orbital changes and the thermal processing. Here we test a number of averaging schemes for elliptic orbits in the context of the long-term evolution of comets, aiming to identify the one that best reproduces the elliptic orbits' heating patterns and the surface and subsurface temperature distributions. We use a simplified thermal evolution model applied on simulated comets both on elliptic and on their equivalent averaged circular orbits, in a range of orbital parameter space relevant to the inner solar system. We find that time averaging schemes are more adequate than spatial averaging ones. Circular orbits created by means of a time average of the equilibrium temperature approximate efficiently the subsurface temperature distributions of elliptic orbits in a large area of the orbital parameter space, rendering them a powerful tool for averaging elliptic orbits.
