Periodograms from CARMENES data (top panel), HIRES/Keck data (second panel), and the combined data set (panel 3). The period of 86.5 d is marked with a vertical red line. Panels 4–9 from top to bottom show the chromatic index (crx), the differential line width (dLw), and the Hα index as defined in Zechmeister et al. (2018), and the FWHM, the bisector contrast, and the bisector span from the CCF. Excess power at around f = 0.047 d−1 in the CARMENES RVs and dLw is likely caused by stellar rotation (left red dashed line; the right dashed line shows its first harmonic at f = 0.094 d−1).
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