LS periodogram for WASP-19 b. The black dashed lines in the upper panel represent sub-harmonics of WASP-19 b’s periodic signal at P ≈ 0.789 d labelled with red dashed lines, while all sub-harmonics are removed in the middle panel. As a contrast, the corresponding FAP periodogram is illustrated in the lower panel. A long-period power "excess" region at P ≳ 1200 d is observed in the LS periodogram, but no obvious distant peaks are detected.