The Pan-Pacific Planet Search III: five companions orbiting giant stars

International audienceWe report a new giant planet orbiting the K giant HD 155233, as well as four stellar-mass companions from the Pan-Pacific Planet Search, a Southern hemisphere radial velocity survey for planets orbiting nearby giants and sub-giants. We also present updated velocities and a refined orbit for HD 47205b (7 CMa b), the first planet discovered by this survey. HD 155233b has a period of 885 +/- 63 d, eccentricity e = 0.03 +/- 0.20, and m sin i = 2.0 +/- 0.5 M-Jup. The stellar-mass companions range in m sin i from 0.066 to 0.33 M-circle dot. Whilst HD 104358B falls slightly below the traditional 0.08 M-circle dot hydrogen-burning mass limit, and is hence a brown-dwarf candidate, we estimate only a 50 per cent a priori probability of a truly sub-stellar mass