论文标题
偏心轨道上的行星迅速侵蚀
Planetesimals on eccentric orbits erode rapidly
论文作者
论文摘要
我们研究了原球磁盘中行星侵蚀的可能性。我们使用理论和直接数值模拟（晶格玻尔兹曼方法）来计算大型的侵蚀 - 比气体分子的平均无路径大得多 - 流中不同形状的体。我们发现侵蚀在中间时间遵循了通用的幂律，与流动的雷诺数和人体的初始形状无关。因此，我们估计，如果其轨道的半高轴位于内部磁盘中，那么（大约一百年来）的怪异轨道中的行星也很快就会消失 - 小于$ 10 $ au。即使是圆形轨道上的行星模拟，如果它们的轨道的半高轴为$ \ Lessapprox 0.6 $ au，则在大约一万年内侵蚀了大约一万年。
We investigate the possibility of erosion of planetesimals in a protoplanetary disk. We use theory and direct numerical simulations (Lattice Boltzmann Method) to calculate the erosion of large -- much larger than the mean-free-path of gas molecules -- bodies of different shapes in flows. We find that erosion follows a universal power-law in time, at intermediate times, independent of the Reynolds number of the flow and the initial shape of the body. Consequently, we estimate that planetesimals in eccentric orbits, of even very small eccentricity, rapidly (in about hundred years) erodes away if the semi-major axis of their orbit lies in the inner disk -- less than about $10$ au. Even planetesimals in circular orbits erode away in approximately ten thousand years if the semi-major axis of their orbits are $\lessapprox 0.6$au.
