The occurrence and the distribution of masses and radii of exoplanets

Details The occurrence and the distribution of masses and radii of exoplanets The occurrence and the distribution of masses and radii of exoplanets

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..276....3m&link_type=abstract

The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution, Proceedings of the International Astronomi

Statistics

Planetary Systems: Formation, Stars: Statistics

Scientific paper

We analyze the statistics of Doppler-detected planets and Keplere-detected planet candidates of high integrity. We determine the number of planets per star as a function of planet mass, radius, and orbital period, and the occurrence of planets as a function of stellar mass. We consider only orbital periods less than 50 days around Solar-type (GK) stars, for which both Doppler and Kepler offer good completeness. We account for observational detection effects to determine the actual number of planets per star. From Doppler-detected planets discovered in a survey of 166 nearby G and K main sequence stars we find a planet occurrence of 15+5-4% for planets with M sin i = 3-30 ME and P < 50 d, as described in Howard et al. (2010). From Keplere, the planet occurrence is 0.130 +/- 0.008, 0.023 +/- 0.003, and 0.013 +/- 0.002 planets per star for planets with radii 2-4, 4-8, and 8-32 RE, consistent with Doppler-detected planets. From Keplere, the number of planets per star as a function of planet radius is given by a power law, df/dlog R = kR Rα with kR = 2.9+0.5-0.4, α = -1.92 +/- 0.11, and R = RP/RE. Neither the Doppler-detected planets nor the Keplere-detected planets exhibit a ``desert'' at super-Earth and Neptune sizes for close-in orbits, as suggested by some planet population synthesis models. The distribution of planets with orbital period, P, shows a gentle increase in occurrence with orbital period in the range 2-50 d. The occurrence of small, 2-4 RE planets increases with decreasing stellar mass, with seven times more planets around low mass dwarfs (3600-4100 K) than around massive stars (6600-7100 K).

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