Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spiral-driven accretion in protoplanetary discs - I. 2D models   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.

8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas