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Context: So far more than 60 substellar companions have been discoveredaround giant stars. These systems present physical and orbital properties thatcontrast to those detected orbiting less evolved stars. Aims: We are conductinga radial velocity survey of 166 bright giant stars in the southern hemisphere.The main goals of our project are to detect and characterize planets inclose-in orbits around giant stars in order to study the effects of the hoststar evolution on their orbital and physical properties. Methods: We haveobtained precision radial velocities for the giant stars HIP67851 and HIP97233that have revealed periodic signals, which are most likely induced by thepresence of substellar companions. Results: We present the discovery of aplanetary system and an eccentric brown dwarf orbiting the giant stars HIP67851and HIP97233, respectively. The inner planet around HIP67851 has a period of88.8 days, a projected mass of 1.4 Mjup and an eccentricity of 0.09. AfterKepler 91b, HIP67851b is the closest-in known planet orbiting a giant star.Although the orbit of the outer object is not fully constrained, it is likely asuper-Jupiter. The brown dwarf around HIP97233 has an orbital period of 1058.8days, a minimum mass of 20.0 Mjup and an eccentricity of 0.61. This is the mosteccentric known brown dwarf around a giant star.

A planetary system and a highly eccentric brown dwarf around the giant stars HIP67851 and HIP97233