Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Possible astrometric discovery of a substellar companion to the closest
  binary brown dwarf system WISE J104915.57-531906.1   Using FORS2 on the Very Large Telescope, we have astrometrically monitored
over a period of two months the two components of the brown dwarf system WISE
J104915.57-531906.1, the closest one to the Sun. Our astrometric measurements -
with a relative precision at the milli-arcsecond scale - allow us to detect the
orbital motion and derive more precisely the parallax of the system, leading to
a distance of 2.020+/-0.019 pc. The relative orbital motion of the two objects
is found to be perturbed, which leads us to suspect the presence of a
substellar companion around one of the two components. We also perform VRIz
photometry of both components and compare with models. We confirm the flux
reversal of the T dwarf.

18
The categories of this paper are: econ
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc