Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: KIC 9632895 - The 10th Kepler Transiting Circumbinary Planet   We present the discovery of KIC 9632895b, a 6.2 Earth-radius planet in a
low-eccentricity, 240.5-day orbit about an eclipsing binary. The binary itself
consists of a 0.93 and 0.194 solar mass pair of stars with an orbital period of
27.3 days. The plane of the planet's orbit is rapidly precessing, and its
inclination only becomes sufficiently aligned with the primary star in the
latter portion of the Kepler data. Thus three transits are present in the
latter half of the light curve, but none of the three conjunctions that
occurred during the first half of the light curve produced transits. The
precession period is ~103 years, and during that cycle, transits are visible
only ~8% of the time. This has the important implication that for every system
like KIC 9632895 that we detect, there are ~12 circumbinary systems that exist
but are not currently exhibiting transits. The planet's mass is too small to
noticeably perturb the binary, consequently its mass is not measurable with
these data; but our photodynamical model places a 1-sigma upper limit of 16
Earth masses. With a period 8.8 times that of the binary, the planet is well
outside the dynamical instability zone. It does, however, lie within the
habitable zone of the binary, and making it the third of ten Kepler
circumbinary planets to do so.

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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: comp-gas