GJ676A radial velocity curve

Using FORS2/VLT, we obtained position measurements of the star in the plane of the sky that tightly constrain its astrometric reflex motion caused by the super-Jupiter planet 'b' in a 1052-day orbit. This allows us to determine the mass of this planet to be M_b_= 6.7^+1.8^_-1.5_M_J_, which is ~40% higher than the minimum mass inferred from the radial-velocity orbit.

Using new HARPS radial-velocity measurements, we improve upon the orbital parameters of the inner low-mass planets 'd' and 'e' and we determine the orbital period of the outer giant planet 'c' to be P_c_=7340-days under the assumption of a circular orbit. The preliminary minimum mass of planet 'c' is M_c_sini=6.8M_J_ with an upper limit of ~39M_J_ that we set using NACO/VLT high-contrast imaging. We also determine precise parallaxes and relative proper motions for both GJ676A and its wide M3 companion GJ676B.