Constraints on Extrasolar Planet Populations from VLT NACO and MMT Direct Imaging Surveys

Physics

Scientific paper

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Scientific paper

We consider the implications of a null result from the direct imaging surveys for self-luminous extrasolar planets conducted at the VLT and MMT, achieving high contrasts at small separations to 65 young, nearby target stars. Analysis of these data suggest a dearth of planets more than three times the mass of Jupiter beyond 15 AU, with fewer than 20% of stars expected to have such a planet. We also consider the effects of spectral type on these results, and the implications for conducting future planet surveys biased toward target stars of later spectral types. Finally, we consider a number of distributions of extrasolar planet orbital parameters, and determine which are consistent both with planets discovered by the radial velocity method, and the null results of our surveys, and which can be ruled out with high confidence.

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