YORP效应中的系统结构和汇
Systematic structure and sinks in the YORP effect
摘要：
大多数小行星的YORP效应的组成部分之间存在相关性，这使得受影响天体的旋转速度和旋转速率保持一致。这就可以清楚和明确地了解受YORP影响的小行星的自旋速率和磁极将如何演变，并简化人口平均迁移的总体情况。YORP效应还可以导致受影响的身体的先前未探索的平衡态。这种平衡态是通常的“正常YORP”效应（由于小行星的整体形状不对称而产生）和“切向YORP”（由于热能通过岩石表面特征的传输而产生）的函数。根据目前的形状模型估计，有10- 20%的小行星具备在这种平衡态下被捕获的适当条件，这表明这种状态的出现可能意义重大。小行星群的这种吸引子的存在意味着受YORP影响的物体可能会离开其通常的YORP周期，并在很长一段时间内保持恒定的自旋速率-这对我们解释小行星自旋速率演化及其物理演化的相关理论具有重要意义。
英文摘要：
There is a correlation between the components of the YORP effect of most asteroids, which drives the obliquity and spin rate of the affected bodies in a consistent pattern. This allows for a clear and unambiguous picture for how the spin rates and poles of asteroids affected by YORP will evolve and simplifies the overall picture for how populations will migrate on average. The YORP effect can also lead to a previously unexplored equilibrium state for affected bodies. This equilibrium state is a function of the usual "normal YORP" effect (which arises due to the global shape asymmetry of the asteroid) and the "tangential YORP" (which arises due the transport of thermal energy through rocky surface features). Estimates from current shape models show that 10-20\% of asteroids have the proper condition to be captured in this equilibrium state, indicating that the occurrence of this state may be significant. The existence of this attractor for the asteroid population means that objects affected by YORP may leave their usual YORP cycles and maintain a constant spin rate over long time periods -- this has significant implications for our interpretation of asteroid spin rate evolution and related theories for their physical evolution.
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