论文标题
冥王星-Charon协奏曲：对Charon作为小卫星的影响
A Pluto-Charon Concerto: An Impact on Charon as the Origin of the Small Satellites
论文作者
论文摘要
我们考虑了一种场景，冥王星和夏隆的小卫星因夏隆与跨纳普尼亚物体（TNO）之间的影响而在碎片中生长。在Charon的轨道运动将碎屑增加成类似磁盘的结构之后，仪表大小或较小物体的快速轨道阻尼对于防止随后的二进制重新进行或动态射击至关重要。根据磁盘进化的分析估计和模拟，我们估计了30-100 km的撞击子半径；较小的（较大）半径适用于倾斜（直接）撞击。尽管当今大型TNO和Charon之间的碰撞不太可能在太阳系的第一个0.1-1 GYR中相对常见。与在产生冥王星二元行星的巨大冲击物留下的小卫星在碎片中凝聚的模型相比，卫星对夏隆的影响避免了均匀的共鸣，这些共振避免了均匀的卫星在二进制早期轨道膨胀过程中扫过卫星。
We consider a scenario where the small satellites of Pluto and Charon grew within a disk of debris from an impact between Charon and a trans-Neptunian Object (TNO). After Charon's orbital motion boosts the debris into a disk-like structure, rapid orbital damping of meter-size or smaller objects is essential to prevent the subsequent re-accretion or dynamical ejection by the binary. From analytical estimates and simulations of disk evolution, we estimate an impactor radius of 30-100 km; smaller (larger) radii apply to an oblique (direct) impact. Although collisions between large TNOs and Charon are unlikely today, they were relatively common within the first 0.1-1 Gyr of the solar system. Compared to models where the small satellites agglomerate in the debris left over by the giant impact that produced the Pluto-Charon binary planet, satellite formation from a later impact on Charon avoids the destabilizing resonances that sweep past the satellites during the early orbital expansion of the binary.
