Fig. 9

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TTV searches in the TESS LCs. The top plot shows the O- C diagram of the individual transits of planet c, and the middle panel presents the GLS periodogram of those observations. The solid line is the periodogram derived from all the 2 min cadence data. The dashed line was obtained after replacing the 2 min by 20s cadence data when available, and proceeding to new transit fits (cf. the orange points in the top plot). We do not find significant periodicity. The bottom plot presents the variation of the orbital period of planet b as measured from pairs of consecutive sectors (with 2 min cadence).
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