Periodicity analysis of the TESS SAP flux of Ross 176. The 10%, 1% and 0.1% FAP levels in the GLS panels are marked as horizontal dashed, dash-dotted and dotted gray lines, respectively. Top panel: GLS periodogram for the SAP data, following the same color criteria for the vertical lines with an exception of the new dark blue line which points out the second harmonic of the stellar rotation period (P_rot)/3 ∼ 10-11 days. Mid panel: median-normalized SAP LC (blue data points) along with the GP celerite quasi-periodic kernel model with a GP_Prot around 32 days (black line). Bottom panel: GLS periodogram of the SAP light curve residuals after subtracting the GP model from the photometric dataset. The period of Ross 176b at 5.01 d (green line) and the FAP lines are also represented.