BLS periodogram of the TESS data. Top: BLS periodogram of all of the TESS sectors. The highest peak reveals the period of TOI-2431 b of 0.22 days, which is highlighted with the black dashed vertical line. Aliases of this period are also shown as faint dashed lines. The horizontal red dashed line shows a SDE of 10, the threshold we adopt for a significant signal. Bottom: BLS periodogram of the TESS data after masking out the transits of TOI-2431 b. No significant peaks are detected.