Low-Mass Protoplanet Migration in T Tauri α-Disks
Low-Mass Protoplanet Migration in T Tauri α-Disks
复制标题
金牛座 T α 盘中的低质量原行星迁移
DOI：
10.1086/382947
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Goodman
中科院分区：
文献类型：
--
作者：
K. Menou;J. Goodman
我们基于忽略圆盘反馈的 Lindblad 扭矩计算，对嵌入稳态 T Tauri α 圆盘中的低质量原行星的 I 型迁移率进行了详细估计。探讨了几种可能的背景盘模型的迁移率差异，并将使用螺旋密度波理论的标准二维形式获得的结果与通过简单处理三维效应获得的结果进行了比较。盘中的不透明度转变导致迁移率突然径向变化。迁移率最小的区域可能是原行星之间引力相互作用的首选地点。三维扭矩明显弱于二维扭矩，并且它们对背景盘的表面密度分布敏感。我们发现，在某些背景盘模型中，即使在亚 AU 距离上，地球质量的原行星的迁移时间也可能超过失控包络吸积时间或金牛座 T 盘寿命。我们得出的结论是，为了获得 I 型迁移率的可靠估计，有必要了解背景盘结构和粘度，以及正确处理扭矩计算中的三维效应。
We present detailed estimates of type I-migration rates for low-mass protoplanets embedded in steady state T Tauri α-disks, based on Lindblad torque calculations ignoring feedback on the disk. Differences in migration rates for several plausible background disk models are explored and we compare results obtained using the standard two-dimensional formalism of spiral density wave theory with those obtained from a simple treatment of three-dimensional effects. Opacity transitions in the disk result in sudden radial variations of the migration rates. Regions with minimal migration rates may be preferred sites of gravitational interactions between protoplanets. Three-dimensional torques are significantly weaker than two-dimensional ones, and they are sensitive to the surface density profile of the background disk. We find that migration times in excess of runaway-envelope-accretion times or T Tauri disk lifetimes are possible for Earth-mass protoplanets in some background disk models, even at sub-AU distances. We conclude that an understanding of the background disk structure and viscosity, as well as a proper treatment of three-dimensional effects in torque calculations, is necessary to obtain reliable estimates of type I-migration rates.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell