Properties of third bodies excluded by RV data. The plot shows the results for the simulated scenarios including a putative companion planet c of different masses at different periods. Each black dot represents one of the around 20 000 selected scenarios (see the text for more details). Top plot: χ² value vs the orbital period of the perturber. The red lines correspond to the period of the stable orbits predicted by Cortés-Zuleta et al. (2020). The two horizontal dashed lines represent the χ² required to have weak (upper line) or strong (lower line) evidence of a second planet, as discussed in the text. Bottom plot: mass and orbital period of the selected candidates.