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Context. Although more than one thousand sub-stellar companions have alreadybeen detected with the radial velocity (RV) method, many new companions remainto be detected in the public RV archives. Aims. We wish to use the archivaldata obtained with the ESO/HARPS spectrograph to search for sub-stellarcompanions. Methods. We use the astronomic acceleration measurements of starsobtained with the Hipparcos and Gaia satellites to identify anomalies thatcould be explained by the presence of a companion. Once hints for a companionare found, we combine the RV data with absolute astrometry and, when available,relative astrometry data, using a Markov Chain Monte Carlo (MCMC) algorithm todetermine the orbital parameters and mass of the companion. Results. We findand characterize three new brown dwarfs (GJ660.1 C, HD73256 B, and HD165131 B)and six new planets (HD75302 b, HD108202 b, HD135625 b, HD185283 b, HIP10337 b,and HIP54597 b) with separations between 1 and 6 au and masses between 0.6 and100 MJup. We also constrain the orbital inclination of ten known sub-stellarcompanions and determine their true mass. Finally, we identify twelve newstellar companions. This shows that the analysis of proper motion anomaliesallows for optimizing the RV search for sub-stellar companions and theircharacterization.

Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions