Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Super-Solar Metallicity For Stars With Hot Rocky Exoplanets   The host star metallicity provide a measure of the conditions in
protoplanetary disks at the time of planet formation. Using a sample of over
20,000 Kepler stars with spectroscopic metallicities from the LAMOST survey, we
explore how the exoplanet population depends on host star metallicity as a
function of orbital period and planet size. We find that exoplanets with
orbital periods less than 10 days are preferentially found around metal-rich
stars ([Fe/H]~ 0.15 +- 0.05 dex). The occurrence rates of these hot exoplanets
increases to ~30% for super-solar metallicity stars from ~10% for stars with a
sub-solar metallicity. Cooler exoplanets, that resides at longer orbital
periods and constitute the bulk of the exoplanet population with an occurrence
rate of >~ 90%, have host-star metallicities consistent with solar. At short
orbital periods, P<10 days, the difference in host star metallicity is largest
for hot rocky planets (<1.7 R_Earth), where the metallicity difference is
[Fe/H] =~ 0.25 +- 0.07 dex. The excess of hot rocky planets around metal-rich
stars implies they either share a formation mechanism with hot Jupiters, or
trace a planet trap at the protoplanetary disk inner edge which is
metallicity-dependent. We do not find statistically significant evidence for a
previously identified trend that small planets toward the habitable zone are
preferentially found around low-metallicity stars. Refuting or confirming this
trend requires a larger sample of spectroscopic metallicities.

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph