TTVs from TESS sectors 1–3 for WASP-18b (top) and WASP-126b (bottom). In both cases, the TTVs appear approximately flat, and a linear ephemeris is preferred to the sinusoidal TTV model according to the BIC statistic. The sinusoidal models also generalize poorly to the more recent TESS data, with ΔBIC  ≈  10 between the predicted transit times of the linear and sinusoidal models for both WASP-18 b and WASP-126 b. The TTV data do not support the existence of WASP-18 c or WASP-126 c (K. A. Pearson 2019).