Systematic Structure and Sinks in the YORP Effect
Systematic Structure and Sinks in the YORP Effect
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DOI：
10.3847/1538-3881/aafd2c
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发表时间：
2019-03-01
影响因子：
5.3
通讯作者：
Scheeres, Daniel J.
中科院分区：
文献类型：
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作者：
Golubov, Oleksiy;Scheeres, Daniel J.
大多数小行星的YORP效应的成分之间存在相关性，这种效应以一致的模式驱动受影响天体的倾角和自转速度。这为受YORP影响的小行星的自转速度和极点将如何演变提供了一幅清晰而毫不含糊的图景，并简化了人口平均迁移的总体图景。YORP效应还可以为受影响的物体带来一种以前从未探索过的平衡状态。这种平衡状态是通常的正常YORP效应(由于小行星的整体形状不对称而产生)和切向YORP效应(由于热能通过岩石表面特征而产生)的函数。目前形状模型的估计表明，10%-20%的小行星具有在这种平衡状态下被捕获的适当条件，这表明这种状态的发生可能是重要的。小行星群体的这种吸引子的存在意味着受YORP影响的物体可能会离开它们通常的YORP周期，并在很长一段时间内保持恒定的自转速度-这对于我们对小行星自转速度演化的解释以及对其物理演化的相关理论具有重要的意义。
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 effect (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.