Results of the Gemini Deep Planet Survey -- Constraints on the Existence of Planets on Wide Orbits

Details Results of the Gemini Deep Planet Survey -- Constraints on the Existence of Planets on Wide Orbits Results of the Gemini Deep Planet Survey -- Constraints on the Existence of Planets on Wide Orbits

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..30l&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Physics

Optics

Scientific paper

We present the results of the Gemini Deep Planet Survey, a near-infrared adaptive optics search for giant planets around 85 nearby young stars. The observations were obtained with the Altair adaptive optics system at the Gemini North telescope and angular differential imaging (ADI) was used to suppress the speckle noise of the central star. For the typical target of the survey, a 100 Myr old K0 star located 22 pc from the Sun, the observations are sensitive enough to detect planets more massive than 2 Mjup with a projected separation in the range 40-200 AU. We will briefly review the ADI technique and its performance, summarize the observations and results, and present a statistical analysis of the survey results which provide upper limits on the fractions of stars with giant planet or low mass brown dwarf companions. The main result of this analysis is that, assuming a planet mass distribution dn/dm ~ m^-1.2 and a semi-major axis distribution dn/da ~ a^-1, the upper limits on the fraction of stars with at least one planet of mass 0.5-13 Mjup are 29% for the range 10-25 AU, 13% for 25-50 AU, and 8.9% for 50-200 AU, with a 95% confidence level.

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