Pileups and Migration Rates for Planets in Low-mass Disks
Pileups and Migration Rates for Planets in Low-mass Disks
复制标题
低质量盘中行星的堆积和迁移率
DOI：
10.3847/1538-4357/ab723c
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Y. Lithwick
中科院分区：
文献类型：
--
作者：
A. Dempsey;Wing;Y. Lithwick
We investigate how planets interact with viscous accretion disks, in the limit that the disk is sufficiently low mass that the planet migrates more slowly than the disk material. In that case, the disk’s surface density profile is determined by the disk being in viscous steady state (VSS) while overflowing the planet’s orbit. We compute the VSS profiles with 2D hydrodynamical simulations, and show that disk material piles up behind the planet, with the planet effectively acting as a leaky dam. Previous 2D hydrodynamical simulations missed the pileup effect because of incorrect boundary conditions, while previous 1D models greatly overpredicted the pileup due to the neglect of nonlocal deposition. Our simulations quantify the magnitude of the pileup for a variety of planet masses and disk viscosities. We also calculate theoretically the magnitude of the pileup for moderately deep gaps, showing good agreement with simulations. For very deep gaps, current theory is inadequate, and we show why and what must be understood better. The pileup is important for two reasons. First, it is observable in directly imaged protoplanetary disks, and hence can be used to diagnose the mass of a planet that causes it or the viscosity within the disk. Second, it determines the planet’s migration rate. Our simulations determine a new Type-II migration rate (valid for low-mass disks), and show how it connects continuously with the well-verified Type-I rate.
DOI：
10.1146/annurev-astro-081811-125523
发表时间：
2012-03
影响因子：
33.3
作者：
W. Kley;R. Nelson
通讯作者：
W. Kley;R. Nelson
影响因子：
4.8
作者：
Yi-Lei Tang;A. MacFadyen;Z. Haiman
通讯作者：
Yi-Lei Tang;A. MacFadyen;Z. Haiman
影响因子：
7.9
作者：
Andrews, Sean M.;Huang, Jane;Ricci, Luca
通讯作者：
Ricci, Luca