The California-Kepler Survey: Precise Planet Radii and Metallicities

Details The California-Kepler Survey: Precise Planet Radii and Metallicities The California-Kepler Survey: Precise Planet Radii and Metallicities

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940501h&link_type=abstract

American Astronomical Society, AAS Meeting #219, #405.01

Astronomy and Astrophysics

Astronomy

1

Scientific paper

For the small subset of sub-Neptune-size planets with well-measured masses and radii, bulk density varies by an order of magnitude, owing to great diversity in composition and atmospheric content. The ensemble of small planets discovered by Kepler have a radius distribution that rises steeply with decreasing size, with close-in sub-Neptune-size planets being an order of magnitude more common than hot Jupiters. However, the detailed structure of the planet radius distribution remains partially veiled by poorly known stellar properties from the Kepler Input Catalog (KIC). Correlations of planet properties with stellar properties are similarly out of focus or unknown. To measure these crucial properties, our team is compiling a new catalog of stellar parameters for the Kepler planet hosts based on LTE modeling of high-resolution Keck-HIRES spectra. I will present initial results from this catalog. We expect detailed structure of the planet radius distribution to emerge, including deviations from a power-law model that suggest common planet sizes and preferred formation scenarios. It will also shed light on the variations of planet occurrence with orbital distance and stellar mass/metallicity, offering important clues for the formation of small worlds.

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