Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: WASP-25b: a 0.6 M_J planet in the Southern hemisphere   We report the detection of a 0.6 M_J extrasolar planet by WASP-South,
WASP-25b, transiting its solar-type host star every 3.76 days. A simultaneous
analysis of the WASP, FTS and Euler photometry and CORALIE spectroscopy yields
a planet of R_p = 1.22 R_J and M_p = 0.58 M_J around a slightly metal-poor
solar-type host star, [Fe/H] = -0.05 \pm 0.10, of R_{\ast} = 0.92 R_{\odot} and
M_{\ast} = 1.00 M_{\odot}. WASP-25b is found to have a density of \rho_p = 0.32
\rho_J, a low value for a sub-Jupiter mass planet. We investigate the
relationship of planetary radius to planetary equilibrium temperature and host
star metallicity for transiting exoplanets with a similar mass to WASP-25b,
finding that these two parameters explain the radii of most low-mass planets
well.

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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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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: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: math-ph