Giant Planets in the Stellar Mass-Metallicity Plane John Johnson, Assistant Professor of Astronomy, Caltech

Correlations between stellar properties and the occurrence rate of exoplanets can be used to inform the target selection of future planet-search efforts and provide valuable clues about the planet-formation process. I will present the results of our analysis of planet occurrence as a function of stellar mass and metallicity among the targets in the California Planet Survey. Included in our sample are M dwarfs with masses as low as 0.25 Msun, "Sun-like" GK stars, and evolved, intermediate-mass (up to 2 Msun) subgiants. We find that both parameters have a strong influence on the occurrence rate of giant planets orbiting within 3 AU of their host stars. I will also present evidence that stars with masses larger than 1.5 solar have a mysterious paucity of planets inward of 1 AU, and that planets around intermediate-mass stars have much lower eccentricities and larger masses compared to the properties of planets around Sun-like stars.