天体的形成和卫星的形成：重力再积累的作用
Formes d'astéroïdes et formation de satellites : rôle de la réaccumulation gravitationnelle
摘要：
小行星的形状和卫星：重力再积累的作用。根据目前的证据，人们普遍认为许多小行星是“引力聚集体”，即缺乏内部凝聚力的天体。它们可能主要起源于某些母体的灾难性分裂，通过产生的碎片的重力重新聚集。同样的事件产生了我们所观察到的动力学家族。在这项工作中，我们解决了引力聚集体形状的起源问题，这可能包含其起源的签名。我们使用一个N体代码来模拟崩溃的碎片云，具有各种初始速度分布和总角动量。碎片被视为inhelastic球，迅速积累，形成旋转的聚集。所得到的形状和旋转性能与理论预测进行比较。结果表明，只有一个精确的类别的形状（扁平的球体）通过这种机制创建。这可能对小行星形状的演变提供有趣的限制，特别是对那些有一个或多个卫星的小行星。
英文摘要：
Asteroid shapes and satellites: role of gravitational reaccumulation. Following current evidences, it is widely accepted that many asteroids would be "gravitational aggregates", i.e. bodies lacking internal cohesion. They could mainly be originated during the catastrophic disruption of some parent bodies, through the gravitational reaccumulation of the resulting fragments. The same events produced the dynamical families that we observe. In this work we address the problem of the origin of shapes of gravitational aggregates, that could contain signatures of their origin. We use a N-body code to simulate the collapse of a cloud of fragments, with a variety of initial velocity distributions and total angular momentum. The fragments are treated as inhelastic spheres, that rapidly accumulate to form rotating aggregates. The resulting shapes and rotational properties are compared with theoretical predictions. The results show that only a precise category of shapes (flattened spheroids) are created via this mechanism. This may provide interesting constraints on the evolution of asteroid shapes, in particular for those with one or more satellites.
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