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Fig. 5


Left panel: activity index log (R) as a function of the RV residuals when removing all the detected signals except the magnetic cycle effect for HD 20003. The observed correlation indicates that most of the RV residual variation is due to activity-related effects. Right panel: barycentric Earth velocity projected on the line of sight (BERV) as a function of the RV residuals around the best derived solution without considering the 184-day signal. The fact that no correlation can be observed disfavours the hypothesis that the 184-day signal is due to a discontinuity in the wavelength calibration introduced by tiny gaps between the different quadrants of the detector.

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