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Context: More than 40 planets have been found around giant stars, revealing alack of systems orbiting interior to $\sim$ 0.6 AU. This observational factcontrasts with the planetary population around solar-type stars and has beeninterpreted as the result of the orbital evolution of planets due to theinteraction with the host star and/or because of a differentformation/migration scenario of planets around more massive stars. Aims: We areconducting a radial velocity study of a sample of 166 giant stars aimed atstudying the population of close-in planets orbiting post-main sequence stars.METHODS: We have computed precision radial velocities from multi-epochspectroscopic data, in order to search for planets around giant stars. Results:In this paper we present the discovery of a massive planet around theintermediate-mass giant star HIP\,63242. The best keplerian fit to the datalead to an orbital distance of 0.57 AU, an eccentricity of 0.23 and a projectedmass of 9.2 \mjup. HIP\,63242\,b is the innermost planet detected around anyintermediate-mass giant star and also the first planet detected in our survey.

cornell university

Study of the impact of the post-MS evolution of the host star on the  orbits of close-in planets. II. A giant planet in a close-in orbit around the  RGB star HIP63242