Fig. 1

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Radial velocities and resulting periodograms of HD 103891. Top left: the HARPS-SERVAL NZP-corrected RVs. pre RVs are colored blue and post RVs are colored red. The best-fit Keplerian model is shown with the solid black line. The bottom panel of this figure shows the residuals. Top right: Δ ln L periodogram of the input RVs. The periodogram shows a peak at 1893 days. The horizontal dashed lines show 0.001 (Green), 0.01 (Yellow), and 0.1 (Red) FAP values. Bottom left: the RV data and Keplerian model, phase folded at the best-fit orbital period. Bottom right: Δ ln L periodogram of the residuals.
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