Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The widest ultracool binary   Aims: I test the ejection scenario of formation of brown dwarfs and very
low-mass stars through the detection of a very wide ultracool binary.
  Methods: LEHPM 494 (M6.0 +/- 1.0 V) and DENIS-P J0021.0-4244 (M9.5 +/- 0.5 V)
are separated by 1.3 arcmin and are high proper motion co-moving ultracool
stars. I have used six astrometric epochs spaced 22 years to confirm their
common tangential velocity.
  Results: The angular separation between both low-mass stars keeps constant
with an uncertainty less than 0.1 %. I have also derived their most probable
heliocentric distance (23 +/- 2 pc), age interval (2-10 Ga) and masses (0.103
+/- 0.006 and 0.079 +/- 0.004 Msol). The pair, with a projected physical
separation of 1800 +/- 170 AU, is by far the widest ultracool binary ever found
in the field.
  Conclusions: This serendipitous and simple detection is inconsistent with
ultra low-mass formation ejection scenarios and complements current searches of
low-mass tight binaries.

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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: solv-int