GLS periodograms of the spectral activity indicators from HARPS-N data. For each panel, the horizontal lines show the theoretical 10% (short-dashed line), 1% (long-dashed line), and 0.1% (dot-dashed line) false alarm probability levels. The vertical dashed lines mark the orbital frequencies of the transiting planet (f_b = 0.0547 d⁻¹) and of the signals detected in the RVs at 5.46 and 60 d. Panels a–c: Cross-correlation full width half maximum (FWHM), bisector (BIS), and contrast (CTR) computed with YABI. Panels d–h: Chromatic index (CRX), differential line width (dLW), Hα, and Na doublet computed with serval. Panels i–j: S-index and $R_{HK}^{\mathrm{\prime }}$ index computed by YABI.