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Fig. 2

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Degeneracies between the star RV and the planet orbital parameters and masses: the case of HD 26161. The RV time series are shown with filled circles, and the fit with a genetic algorithm is illustrated with the blue curve. Top: all priors are left free. We use red for Hir94, green for Hir04, and blue for APF. Middle: semi-major axis is fixed to 240 au. The same color codes are used as in the top. Bottom: star RV is fixed to 300 m s−1. The black points correspond to RVs corrected from the instrumental offsets for clarity purposes. The semi-major axes found are 33 au, 240 au, and 42 au and the minimum mass found are 14 MJup, 23 MJup, and 80 MJup, while the rms of the residuals are almost identical (6.2 m s−1,7 m s−1, and 7.2 m s−1).

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