Results. Although we attempted to rule out the presence of binaries on the basis of previous surveys, we detected 14 new binary candidates in our sample, most of them identified from a comparison between HARPS and CORAVEL data. We also suggest 11 new planet-host candidates based on a relation between the stellar surface gravity and Delta RV/2. Ten of the candidates are less than 3 M-circle dot, showing evidence of a low planet occurrence rate for massive stars. One of the planet-host candidates and one of the binary candidates show very clear RV periodic variations, allowing us to confirm the discovery of a new planet and to compute the orbital solution for the binary. The planet is IC 4651 9122b, with a minimum mass of msin i = 6.3 M-J and a semimajor axis a = 2.0 AU. The binary companion is NGC 5822 201B, with a very low minimum mass of msin i = 0.11 M-circle dot and a semimajor axis a = 6.5 AU, which is comparable to the Jupiter distance to the Sun.