Planet sample on the period–mass plane, with thin- and thick-disk affiliation colour-coded in the same way as in Fig. 1. The circle sizes represent the masses of the host stars. Planets in the same system are connected by dotted lines. The dashed lines represent the RV detection threshold for circular planetary signals corresponding to semi-amplitudes of 1, 3, and 5 m s⁻¹ (from bottom to top), for a 1 M_⊙ star.