论文标题
从Hayabusa2 Mission Impact实验的数值模拟中，小行星（162173）Ryugu的限制表面特性（162173）
Constraining surface properties of asteroid (162173) Ryugu from numerical simulations of Hayabusa2 mission impact experiment
论文作者
论文摘要
Hayabusa2任务影响小行星Ryugu的实验产生了一个意外的大火山口。到目前为止，低重力，低强度壁壁的相关状态仍未开发，因为这些影响条件无法在地球实验室实验中重新创建。在这里，我们表明目标内聚力可能非常低，并且影响可能发生在强度和重力之间的过渡性壁板状态中。对于这种情况，我们的数值模拟能够再现对Ryugu的影响的结果，包括最初位于影响点附近的巨石的影响。与最新的Ryugu和Bennu分析一致，从我们的结果中得出的壁claging缩放法律表明，小型小行星的表面必须很年轻。但是，我们的结果还表明，存在很少的凝聚力可能会严重影响壁壁效率。因此，不同地质表面单位在Ryugu上的不同年龄可能是由于凝聚力的影响。
The Hayabusa2 mission impact experiment on asteroid Ryugu created an unexpectedly large crater. The associated regime of low-gravity, low-strength cratering remained largely unexplored so far, because these impact conditions cannot be re-created in laboratory experiments on Earth. Here we show that the target cohesion may be very low and the impact probably occurred in the transitional cratering regime, between strength and gravity. For such conditions, our numerical simulations are able to reproduce the outcome of the impact on Ryugu, including the effects of boulders originally located near the impact point. Consistent with most recent analysis of Ryugu and Bennu, cratering scaling-laws derived from our results suggest that surfaces of small asteroids must be very young. However, our results also show that the cratering efficiency can be strongly affected by the presence of a very small amount of cohesion. Consequently, the varying ages of different geological surface units on Ryugu may be due to the influence of cohesion.
