Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.485..117q&link_type=abstract
In: Proceedings of the First Eddington Workshop on Stellar Structure and Habitable Planet Finding, 11 - 15 June 2001, Córdoba, S
Computer Science
4
Extra-Solar Planets, Radial Velocity Surveys
Scientific paper
Today 68 planets have been discovered by precise Doppler measurements. The observed planet detection rate is about 3% on G and K nearby stars. However the planet mass function is rising toward low mass planets. It suggests that we are still missing a lot of giant planets with smaller masses. The observed diversity in the orbital characteristics of extra-solar planets discovered so far contrasts with the almost circular orbits of giant planets in our own solar system. The shape of the binary mass function of the extra-solar planets is not the continuation of the stellar companion mass function. It provides an argument for a formation mechanism different from stars that remains to be understood. The extra-solar planets that we have found do not fit into the standard planetary formation scenario. Micro-lensing experiments have not detected any short magnification that could be clearly interpreted as a planet micro-lensing event. However this negative results allow to set an upper limit of 25% on the occurrence of planets on M stars producing the micro-lensing events. The metal content of stars bearing planets is unusually high. It may be the consequence of an intrinsically richer proto-planetary nebula that would favor giant planet formation. One star bearing traces of planetary materials not mixed into the star have been found. It is an argument in this case for a multi-planet interaction or planet migration phenomenon like.
Mayor Marcel
Queloz Didier
Santos Nuno Cardoso
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