Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accretion and Outflow Activity in Brown Dwarfs   An investigation of the magnetospheric accretion and outflow signatures in
sub-stellar objects is a natural extension of similar studies conducted on
classical T Tauri stars (CTTS), and helps understand if brown dwarfs (BDs)
follow the same formation mechanism as stars. Over the past decade, evidence
for accretion in very low-mass stars (VLMs) and BDs has been accumulated using
various techniques, which indicates that the overall accretion characteristics
are continuous across the sub-stellar boundary. Outflow activity in VLMs and
BDs has been confirmed based on spectro-astrometry of forbidden emission lines
observed in the optical, and in millimetre continuum images of CO J=2-1
emission. This review summarizes the past and current state of observational
work on accretion and outflow activity in VLMs and BDs, particularly with the
advent of new instruments such as VLT/X-Shooter which has allowed the study of
several accretion and outflow indicators over a wider wavelength range.

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The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: adap-org