Scaling forces to asteroid surfaces: The role of cohesion
Scaling forces to asteroid surfaces: The role of cohesion
复制标题
DOI：
10.1016/j.icarus.2010.07.009
复制
发表时间：
2010-02
期刊：
影响因子：
3.2
通讯作者：
D. Scheeres;C. Hartzell;Diego Paul Sánchez Lana;M. Swift
中科院分区：
文献类型：
--
作者：
D. Scheeres;C. Hartzell;Diego Paul Sánchez Lana;M. Swift
在小行星表面发现的极低的环境重力加速度制度的物理力的缩放进行。由此发现，小行星表面风化层颗粒之间的货车德瓦耳斯凝聚力应该是一种主导力，与颗粒重量竞争，一般来说大于静电和太阳辐射压力。基于这种缩放，我们解释以前的实验在陆地环境中进行的粘性粉末作为相关的小行星表面上的过程的理解。这些地面实验解释观测小行星表面和宏观孔隙度的影响被认为是，并产生不同的解释，从以前假设的这些环境的过程。基于这一认识，我们提出了一个新的模型的小，快速旋转的小行星的最终状态，使它们能够由相对较细的风化颗粒举行在一起的货车德瓦尔斯凝聚力。
The scaling of physical forces to the extremely low ambient gravitational acceleration regimes found on the surfaces of small asteroids is performed. Resulting from this, it is found that van der Waals cohesive forces between regolith grains on asteroid surfaces should be a dominant force and compete with particle weights and be greater, in general, than electrostatic and solar radiation pressure forces. Based on this scaling, we interpret previous experiments performed on cohesive powders in the terrestrial environment as being relevant for the understanding of processes on asteroid surfaces. The implications of these terrestrial experiments for interpreting observations of asteroid surfaces and macro-porosity are considered, and yield interpretations that differ from previously assumed processes for these environments. Based on this understanding, we propose a new model for the end state of small, rapidly rotating asteroids which allows them to be comprised of relatively fine regolith grains held together by van der Waals cohesive forces.