Photoevaporation of protoplanetary discs I: hydrodynamic models
Photoevaporation of protoplanetary discs I: hydrodynamic models
复制标题
DOI：
10.1111/j.1365-2966.2006.10293.x
复制
发表时间：
2006-03
期刊：
影响因子：
--
通讯作者：
R.D.Alexander;C.J.Clarke;J.E.Pringle
中科院分区：
文献类型：
--
作者：
R.D.Alexander;C.J.Clarke;J.E.Pringle
本文讨论了直接电离恒星辐射fffi对光蒸发风作用下原行星盘演化的影响。我们认为，将粘性演化与盘的光蒸发相结合的模型(如Clarke，Gendrin&Sotomayor 2001)在演化的后期错误地忽略了内盘排干后的直接fi场。我们首先用简单的解析方法建立了直接fifi产生的光蒸发风的模式，然后用详细的数值流体力学方法建立了模式。我们fi发现，由直接fi磁场在后期产生的风比以前假设的要大得多，并且我们证明了质量损失率的标度为R1/2in(其中Rin是瞬时盘内边缘的半径)。我们认为，这一结果对盘进化理论具有重要的影响，并在一篇配对论文(Alexander，Clarke&Pringle 2006b)中详细讨论了这一结果对盘演化的影响。
In this paper we consider the e ff ect of the direct ionizing stellar radiation field on the evolution of protoplanetary discs subject to photoevaporative winds. We suggest that models which combine viscous evolution with photoevaporation of the disc (e.g. Clarke, Gendrin & Sotomayor 2001) incorrectly neglect the direct field after the inner disc has drained, at late times in the evolution. We construct models of the photoevaporative wind produced by the direct field, first using simple analytic arguments and later using detailed numerical hydrodynamics. We find that the wind produced by the direct field at late times is much larger than has previously been assumed, and we show that the mass-loss rate scales as R 1 / 2 in (where R in is the radius of the instantaneous inner disc edge). We suggest that this result has important consequences for theories of disc evolution, and go on to consider the e ff ects of this result on disc evolution in detail in a companion paper (Alexander, Clarke & Pringle 2006b).