标题： 螺旋驱动的原行星盘吸积 - I. 二维模型 显示英文标题

标题： Spiral-driven accretion in protoplanetary discs - I. 2D models

摘要： 我们数值研究了由外部包层流入包围的2D非磁化原行星盘的动力学。 我们发现盘与流入之间的吸积激波是不稳定的，导致产生大振幅的螺旋密度波。 这些螺旋波可以传播很长的距离，直到半径至少比吸积激波半径小十倍。 我们测量了由螺旋波驱动的向外角动量输运，在流入吸积率Mout>1e-8 Msun/yr时，alpha的范围为1e-4 < alpha < 1e-2。 我们得出结论，盘与其包层的相互作用导致了长寿命的螺旋密度波以及径向角动量输运，其速率在年轻的非磁化原恒星盘中不能被忽略。 显示英文摘要

摘要： We numerically investigate the dynamics of a 2D non-magnetised protoplanetary disc surrounded by an inflow coming from an external envelope. We find that the accretion shock between the disc and the inflow is unstable, leading to the generation of large-amplitude spiral density waves. These spiral waves propagate over long distances, down to radii at least ten times smaller than the accretion shock radius. We measure spiral-driven outward angular momentum transport with 1e-4 < alpha < 1e-2 for an inflow accretion rate Mout>1e-8 Msun/yr. We conclude that the interaction of the disc with its envelope leads to long-lived spiral density waves and radial angular momentum transport with rates that cannot be neglected in young non-magnetised protostellar discs.