Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741506h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #415.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
2
Scientific paper
We report the occurrence rate of close-in planets (orbital periods less than 50 days) based on precise Doppler measurements of 166 G and K-type dwarf stars. We statistically study the planet detections and non-detections on a star-by-star basis using 3.5 years of Keck RV measurements made specifically for the NASA-UC Eta-Earth Survey. We measure increasing planet occurrence with decreasing planet mass over three decades in planet mass, from Jupiters to super-Earths. Extrapolation of a power law mass distribution fitted to our measurements, df/dlogM = 0.39M-0.48, predicts that 23% of stars harbor a close-in, Earth-like planet (0.5-2.0 Earth-masses). Population synthesis models of planet formation by core accretion predict a deficit of planets in the domain of 5-30 Earth-masses (the "planet desert") and orbital periods less than 50 days. This region of parameter space is in fact well populated, implying that such models need significant revision.
Anderson Jeffrey
Fischer Debra
Howard Andrew
Ida Shigeru
Johnson Jennifer A.
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