Predicted departure from the linear transit ephemeris for WASP-173A b if dynamical tides are efficiently dissipated in the host’s interior. The green area shows the possible scenarios for $Q_{\star ,\text{WB}}^{\prime }$ between 1.5 × 10⁵ (lower envelope, the present constraint from observations) and 1.5 × 10⁶ (upper envelope) if WB operates. The data points are the same as in Fig. 3. The mustard line tracks the time shift governed by dissipation due to the WNL effects with $Q_{\star ,\text{WNL}}^{\prime }$ of ~ 2.9 × 10⁶ that is close to the value obtained from stellar spinning-up by Labadie-Bartz et al. (2019). The uncertainties of the present linear ephemeris are illustrated with 100 lines drawn from the posterior distribution.