Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M
  dwarf binary   We present the discovery of a 360 AU separation T3 companion to the tight
(3.1 AU) M4.5+M6.5 binary 2MASS J02132062+3648506. This companion was
identified using Pan-STARRS1 data and, despite its relative proximity to the
Sun (22.2$_{-4.0}^{+6.4}$ pc; Pan-STARRS1 parallax) and brightness ($J$=15.3),
appears to have been missed by previous studies due to its position near a
diffraction spike in 2MASS. The close M~dwarf binary has active X-ray and
H$\alpha$ emission and shows evidence for UV flares. The binary's weak {\it
GALEX} UV emission and strong Na I 8200\AA Na absorption leads us to an age
range of $\sim$1-10Gyr. Applying this age range to evolutionary models implies
the wide companion has a mass of 0.063$\pm$0.009\,$M_{\odot}$. 2MASS J0213+3648
C provides a relatively old benchmark close to the L/T transition and acts as a
key, older comparison to the much younger early-T companions HN~Peg~B and
GU~Psc~b.

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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc