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Planet searches around evolved giant stars are bringing new insights toplanet formation theories by virtue of the broader stellar mass range of thehost stars compared to the solar-type stars that have been the subject of mostcurrent planet searches programs. These searches among giant stars areproducing extremely interesting results. Contrary to main sequence starsplanet-hosting giants do not show a tendency of being more metal rich. Even iflimited, the statistics also suggest a higher frequency of giant planets (atleast 10 %) that are more massive compared to solar-type main sequence stars.The interpretation of these results is not straightforward. We propose that thelack of a metallicity-planet connection among giant stars is due to pollutionof the star while on the main sequence, followed by dilution during the giantphase. We also suggest that the higher mass and frequency of the planets aredue to the higher stellar mass. Even if these results do not favor a specificformation scenario, they suggest that planetary formation might be more complexthan what has been proposed so far, perhaps with two mechanisms at work and oneor the other dominating according to the stellar mass. We finally stress as thedetailed study of the host stars and of the parent sample is essential toderive firm conclusions.

Testing planet formation theories with Giant stars