Time series (left) and GLS periodograms (right) of the RV and activity indicators derived from the CCF for TZ Ari. The stellar rotation period (1.96 d) is marked in purple; the planetary orbital period from the literature (722.05 d; Quirrenbach et al. 2022) is marked in light blue; and the 0.1%, 1%, and 10% FAP levels are shown with dashed orange lines. The frequency axis of the periodogram show two scales split at 0.035 d⁻¹ to better visualise long-term variability. The RVs display low-frequency signals associated with the Keplerian motion of TZ Ari b, while the CON and FWHM show lower-frequency stellar activity signals.