Dynamical mechanisms of ejecta evolution in binary asteroid systems
The surface regolith layers of asteroids and their nearby space ejecta will change under impacts.As a result,some small bodies show increased activity,which provides key insights into the dynamics of planetary evolution.The paper focuses on the dynamical mechanisms of ejecta evolution in binary asteroid systems under impact effects.A dynamical model is established,considering the gravitational influence of binary asteroids with irregular shapes and heterogeneous internal structures,as well as various forces in the solar system,to simulate the dynamics of the ejecta.In this model,a non-structured surface rapid collision detection technique is developed for detecting contact collisions between the ejecta and the asteroid surface.The model comprehensively accounts for factors such as solar radiation pressure,planetary gravity,and complex features on the asteroid's surface during the ejecta rebound process.Large-scale simulations of ejecta evolution in binary asteroid systems are conducted,analyzing the evolution processes and dynamical mechanisms of ejecta ranging from 0.01 mm to 10 m in diameter.
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