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

被引：45

作者：

Lesur, Geoffroy ^{[1
,2
]}

Hennebelle, Patrick ^{[3
]}

Fromang, Sebastien ^{[3
]}

机构：

[1] Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France

[2] CNRS, IPAG, F-38000 Grenoble, France

[3] Univ Paris 07, CNRS, Lab AIM, CEA,DSM,Irfu,Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 582卷

基金：

欧洲研究理事会;

关键词：

accretion; accretion disks; hydrodynamics; waves; ROSSBY-WAVE INSTABILITY; BINARY-SYSTEMS; DISKS; INFALL; PLUTO; CODE;

D O I：

10.1051/0004-6361/201526734

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 10(-4) less than or similar to alpha < 10(-2) for an inflow accretion rate. M-inf greater than or similar to 10(-8) M-circle dot yr(-1). 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.

引用

页数：4

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