True mass of the companions versus the orbital period. The horizontal solid lines show the 30, 55, and 80 M_Jup mass limits, respectively. The dashed lines show the expected detection mass limits for companions around solar like stars (1M_⊙) at a distance of 35pc considering astrometric signatures of α = 200 µas (approximate current capacity) and a = 75 µas (approximate astrometric signature expected to be detectable in Gaia DR4 considering a base uncertainty of 25µas and a signal-to-noise ratio, S/N, of 3).