Vortices in the Co-orbital Region of an Embedded Protoplanet
Vortices in the Co-orbital Region of an Embedded Protoplanet
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嵌入式原行星共轨道区域的涡旋
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. Lin
中科院分区：
文献类型：
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作者：
J. Koller;Hui Li;D. Lin
我们提出了全球二维无粘磁盘模拟嵌入行星，强调在其共轨区域的非线性动力学。我们发现，在这个地区的流动的位涡是不守恒的，因为存在两个螺旋冲击产生的行星。随着系统的发展，位涡廓线出现极值（拐点），最终使流动不稳定。涡的产生与位涡最小值有关。这些漩涡诞生于分界线区域，与行星近距离接触，因此对行星施加了强大的扭矩。这些涡旋的存在对于理解低质量行星的迁移率具有重要意义。
We present global two-dimensional inviscid disk simulations with an embedded planet, emphasizing the nonlinear dynamics in its co-orbital region. We find that the potential vorticity of the flow in this region is not conserved because of the presence of two spiral shocks produced by the planet. As the system evolves, the potential vorticity profile develops extrema (inflection points) that eventually render the flow unstable. Vortices are produced in association with the potential vorticity minima. Born in the separatrix region, these vortices experience close encounters with the planet, consequently exerting strong torques on the planet. The existence of these vortices have important implications for understanding the migration rates of low-mass planets.