论文标题
过渡磁盘中的灰尘动态：结块和磁盘衰退
Dust Dynamics in Transitional Disks: Clumping and Disk Recession
论文作者
论文摘要
在本文中，辐射压力在尘埃迁移中的作用和过渡性磁盘中的内部空腔的打开作用。在轴对称模型中经常研究包括辐射压力在内的灰尘动力学，但是在这项工作中，我们表明高度非轴对称特征可能是由于内部磁盘边缘的不稳定性引起的。尘埃颗粒凝结成高密度的特征，使辐射在它们周围泄漏，并更深入磁盘，改变灰尘迁移的过程。我们的概念验证，二维，垂直平均模拟表明，辐射压力，阴影和气阻力的结合可以使磁盘的尘埃成分产生净向外迁移或衰退。内部磁盘边缘的经济衰退速度在我们的参数空间中的$ 10^{ - 5} $ times keplerian速度（假设Shakura＆Sunyaev粘度alpha $ \ lysesim 10^{ - 3} $，它比背景粘性流程更快。如果在磁盘的一生中保持这种速度，则可能导致尘埃腔尽可能大。
The role of radiation pressure in dust migration and the opening of inner cavities in transitional disks is revisited in this paper. Dust dynamics including radiation pressure is often studied in axisymmetric models, but in this work, we show that highly non-axisymmetric features can arise from an instability at the inner disk edge. Dust grains clump into high density features there, allowing radiation to leak around them and penetrate deeper into the disk, changing the course of dust migration. Our proof-of-concept, two-dimensional, vertically-averaged simulations show that the combination of radiation pressure, shadowing, and gas drag can produce a net outward migration, or recession, of the dust component of the disk. The recession speed of the inner disk edge is on the order of $10^{-5}$ times Keplerian speed in our parameter space, which is faster than the background viscous flow, assuming a Shakura & Sunyaev viscosity alpha $\lesssim 10^{-3}$. This speed, if sustained over the lifetime of the disk, can result in a dust cavity as large as tens of au.
