Giant planet migration is an important phenomenon in the evolution of planetary systems. Recent works have shown that giant planet growth and migration can shape the asteroid belt, but these works have not considered interactions between planetesimals. We have calculated the evolution of planetesimal disks, including planetesimal–planetesimal collisions, during gas giant growth and migration. The numbers, locations, and impact velocities of these collisions depend on the specific growth and migration path. We find that giant planet growth alone has little effect on impact velocities, and most of the planetesimals scattered by growing giants do not undergo collisions. In contrast, we find that giant planet migration induces large numbers of high-velocity collisions between planetesimals. These impacts have sufficient velocities to cause shock-induced vaporization for both water ice and silicate components of planetesimals and to cause disruption of the bodies. New bodies may form...

中文翻译：

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在巨人的阴影中相撞：天然气巨人生长和迁移期间的小行星碰撞

巨行星迁移是行星系统演化中的重要现象。最近的工作表明，巨大的行星生长和迁移可以塑造小行星带，但这些工作并未考虑小行星之间的相互作用。我们已经计算了天然气巨头生长和迁移过程中行星盘的演化，包括行星-行星碰撞。这些碰撞的数量，位置和撞击速度取决于特定的增长和迁移路径。我们发现，仅巨型行星的增长对撞击速度几乎没有影响，并且由成长中的巨星散布的大多数小行星不会发生碰撞。相反，我们发现，巨大的行星迁移会引起小行星之间发生大量的高速碰撞。这些撞击具有足够的速度，可引起行星状冰的水冰和硅酸盐成分的震动诱发汽化，并导致物体破裂。可能会形成新的身体...