Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Earth-mass Planet in a 1-AU Orbit around an Ultracool Dwarf   We combine $Spitzer$ and ground-based KMTNet microlensing observations to
identify and precisely measure an Earth-mass ($1.43^{+0.45}_{-0.32} M_\oplus$)
planet OGLE-2016-BLG-1195Lb at $1.16^{+0.16}_{-0.13}$ AU orbiting a
$0.078^{+0.016}_{-0.012} M_\odot$ ultracool dwarf. This is the lowest-mass
microlensing planet to date. At $3.91^{+0.42}_{-0.46}$ kpc, it is the third
consecutive case among the $Spitzer$ "Galactic distribution" planets toward the
Galactic bulge that lies in the Galactic disk as opposed to the bulge itself,
hinting at a skewed distribution of planets. Together with previous
microlensing discoveries, the seven Earth-size planets orbiting the ultracool
dwarf TRAPPIST-1, and the detection of disks around young brown dwarfs,
OGLE-2016-BLG-1195Lb suggests that such planets might be common around
ultracool dwarfs. It therefore sheds light on the formation of both ultracool
dwarfs and planetary systems at the limit of low-mass protoplanetary disks.

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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: math
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys