Five later TESS transits of TOI-1221 b have more than one timing peak with a fixed shape

We measured timing information from five later public TESS transits of TOI-1221 b. The events are in sectors 64, 67, 88, 94, and 97, in 2023 and 2025. We integrated depth and baseline terms over a full center-time grid. The main model uses a fixed transit shape and a scalar noise correction. All five timing likelihoods have more than one peak. Their standard deviations are 12.7 to 25.3 minutes. Only 19 to 42 percent of each curve lies inside its initial local fit error band. We compared the curves with joint predictions from eight published discovery times. The score ratio for a 400-to-600-day sine forecast against a line forecast is 6.56. This is a conditional prediction test, not an absolute rejection probability. The transit shape and noise model limit the result. No unique companion orbit follows. The package includes source FITS files, exact hashes, forty timing curves, code, and reproduction instructions.

TOI-1221 b · TESS · transit timing · timing likelihood · public data · reproducible analysis