论文标题
在行星信封中积聚侵蚀卵石和行星
Accretion of eroding pebbles and planetesimals in planetary envelopes
论文作者
论文摘要
风侵蚀是一种破坏性机制，如果速度相对于环境气体和局部气体压力，将弱绑定的物体（如行星）完全溶解到其组成颗粒中。在数值模拟中，我们研究了这样的风侵蚀对卵石和行星积聚的影响，而行星体高达$ 10 r_ \ mathrm {arter} $。由于小体内小体的尺寸迅速减小，积聚结果发生了显着变化。侵蚀会导致在10 m的小体阈值以下的积聚效率下降。对于给定的小体尺寸分布，这会显着减慢卵石积聚。小体的阈值半径随着行星半径的增加而增加，并且随着半高轴的增加而减小。在所研究的参数中，额外的行星气氛（最多1 bar）是较小的。
Wind erosion is a destructive mechanism that completely dissolves a weakly bound object like a planetesimal into its constituent particles, if the velocity relative to the ambient gas and the local gas pressure are sufficiently high. In numerical simulations we study the influence of such wind erosion on pebble and planetesimal accretion by a planetary body up to $10 R_\mathrm{Earth}$. Due to the rapid size reduction of an in-falling small body, the accretion outcome changes significantly. Erosion leads to a strong decrease in the accretion efficiency below a threshold size of the small body on the order of 10 m. This slows down pebble accretion significantly for a given size distribution of small bodies. The threshold radius of the small body increases with increasing planet radius and decreases with increasing semi-major axis. Within the parameters studied, an additional planetary atmosphere (up to 1 bar) is of minor importance.
