Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gas flow and accretion via spiral streamers and circumstellar disks in a
  young binary protostar   The majority of stars are part of gravitationally bound stellar systems, such
as binaries. Observations of protobinary systems constrain the conditions that
lead to stellar multiplicity and subsequent orbital evolution. We report
high-angular resolution observations of the circumbinary disk around [BHB2007]
11, a young binary protostar system. The two protostars are embedded in
circumstellar disks that have radii of 2 to 3 astronomical units and probably
contain a few Jupiter masses. These systems are surrounded by a complex
structure of filaments connecting to the larger circumbinary disk. We also
observe accretion and radio jets associated with the protobinary system. The
accretion is preferentially onto the lower-mass protostar, consistent with
theoretical predictions.

20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph