Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Correlation Between the Eclipse Depths of Kepler Gas Giant Candidates
  and the Metallicities of their Parent Stars   Previous studies of the interior structure of transiting exoplanets have
shown that the heavy element content of gas giants increases with host star
metallicity. Since metal-poor planets are less dense and have larger radii than
metal-rich planets of the same mass, one might expect that metal-poor stars
host a higher proportion of gas giants with large radii than metal-rich stars.
Here I present evidence for a negative correlation at the 2.3-sigma level
between eclipse depth and stellar metallicity in the Kepler gas giant
candidates. Based on Kendall's tau statistics, the probability that eclipse
depth depends on star metallicity is 0.981. The correlation is consistent with
planets orbiting low-metallicity stars being, on average, larger in comparison
with their host stars than planets orbiting metal-rich stars. Furthermore,
since metal-rich stars have smaller radii than metal-poor stars of the same
mass and age, a uniform population of planets should show a rise in median
eclipse depth with [M/H]. The fact that I find the opposite trend indicates
that substantial changes in gas giant interior structure must accompany
increasing [M/H]. I investigate whether the known scarcity of giant planets
orbiting low-mass stars could masquerade as an eclipse depth-metallicity
correlation, given the degeneracy between metallicity and temperature for cool
stars in the Kepler Input Catalog. While the eclise depth-metallicity
correlation is not yet on firm statistical footing and will require
spectroscopic [Fe/H] measurements for validation, it is an intriguing window
into how the interior structure of planets and even the planet formation
mechanism may be changing with Galactic chemical evolution.

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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: plasm-ph