Fig. 7
GLS periodograms of the S- and H-index measurements from the HIRES data for GJ 1148. Only the H-index periodogram reveals a significant peak at 121,7 d, likely related to activity, but not associated with the stellar rotation for GJ 1148 Prot = 73.5 d (red dashed line), or with either of the planetary periods Pb = 41.4 d and Pc = 532.6 d (blue dashed lines) seen in the HIRES RVs.
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