Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: TOI-2119: A transiting brown dwarf orbiting an active M-dwarf from
  NASA's TESS mission   We report the discovery of TOI-2119b, a transiting brown dwarf (BD) that
orbits and is completely eclipsed by an active M-dwarf star. Using light curve
data from the Transiting Exoplanet Survey Satellite mission and follow up
high-resolution Doppler spectroscopic observations, we find the BD has a radius
of $R_b = 1.08 \pm 0.03{\rm R_J}$, a mass of $M_b = 64.4 \pm 2.3{\rm M_J}$, an
orbital period of $P = 7.200865 \pm 0.00002$ days, and an eccentricity of
$e=0.337\pm 0.002$. The host star has a mass of $M_\star = 0.53 \pm 0.02{\rm
M_\odot}$, a radius of $R_\star= 0.50 \pm 0.01{\rm R_\odot}$, an effective
temperature of $T_{\rm eff} = 3621 \pm 48{\rm K}$, and a metallicity of $\rm
[Fe/H]=+0.06\pm 0.08$. TOI-2119b joins an emerging population of transiting BDs
around M-dwarf host stars, with TOI-2119 being the ninth such system. These
M-dwarf--brown dwarf systems occupy mass ratios near $q = M_b/M_\star \approx
0.1$, which separates them from the typical mass ratios for systems with
transiting substellar objects and giant exoplanets that orbit more massive
stars. TOI-2119 is also one of the most active M-dwarf stars known to host a
transiting brown dwarf. The nature of the secondary eclipse of the BD by the
star enables us to estimate the effective temperature of the substellar object
to be $2030\pm 84 {\rm K}$, which is consistent with predictions by substellar
evolutionary models.

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The categories of this paper are: cs
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ