根据理想模式从小的无气物体内部的冰损失
Ice loss from the interior of small airless bodies according to an idealized model
摘要：
主带小行星和近地天体（近地天体）中的冰具有科学和资源勘探的意义，但小型无空气天体的冰会通过向外扩散逐渐流失到太空。在这里，我们定量估计的时间，它需要一个多孔的无空气的身体失去所有的内部冰，在稳定轨道上的机构的内部温度场的解析解的基础上。在没有潜热的情况下，低于经典有效温度的平均地面温度代表身体内部，因此是评估干燥时间尺度的适当温度。在球平均模型中，得到了冰深随时间和完全干燥时间变化的显式解析解。在11%的时间后，一半的冰体积会消失。双叶结构源于干燥速率对纬度的强烈依赖性。寒冷的极地地区可以隐藏地下冰，即使身体中心没有。潜热阻碍了冰的损失，我们得到了一个简洁的表达式之间的表面和冰的温差。在外主带中，几乎所有大小为10公里或更大的天体在太阳系的年龄内都应该能够在其内部保持冰。以下每一个因素都有利于近地天体内部存在冰：半长轴位于外带或更远的地方，地幔的热惯性很低，年龄很小，或者轴倾斜很小且稳定。
英文摘要：
Ice in main belt asteroids and Near Earth Objects (NEOs) is of scientific and resource exploration interest, but small airless bodies gradually lose their ice to space by outward diffusion. Here, we quantitatively estimate the time it takes a porous airless body to lose all of its interior ice, based on an analytic solution for the interior temperature field of bodies in stable orbits. Without latent heat, the average surface temperature, which is lower than the classic effective temperature, is representative of the body interior and hence an appropriate temperature to evaluate desiccation time scales. In a spherically averaged model, an explicit analytic solution is obtained for the depth to ice as a function of time and the time to complete desiccation. Half of the ice volume is lost after 11% of this time. A bilobate structure emerges from the strong latitude dependence of desiccation rates. Cold polar regions can harbor subsurface ice, even when the body center does not. Latent heat retards ice loss, and we obtain a succinct expression for the temperature difference between the surface and the ice. In the outer main belt, nearly all bodies 10~km in size or larger should have been able to retain ice in their interiors over the age of the solar system. Each of the following factors favors the presence of ice inside NEOs: a semi-major axis in the outer belt or beyond, a mantle of very low thermal inertia, a young age, or a small and stable axis tilt.
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