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We present a new analysis of the light curve of the young planet-hosting starTOI 451 in the light of new observations from TESS Cycle 3. Our joint analysisof the transits of all three planets, using all available TESS data, results inan improved ephemeris for TOI 451 b and TOI 451 c, which will help to planfollow-up observations. The updated mid-transit times are$\textrm{BJD}-2,457\,000=$ $1410.9896_{ - 0.0029 }^{ + 0.0032 }$,$1411.7982_{-0.0020}^{+0.0022}$, and $1416.63407_{-0.00100}^{+0.00096}$ for TOI451 b, c, and d, respectively, and the periods are$1.8587028_{-10e-06}^{+08e-06}$, $9.192453_{-3.3e-05}^{+4.1e-05}$, and$16.364932_{-3.5e-05}^{+3.6e-05 }$ days. We also model the out-of-transit lightcurve using a Gaussian Process with a quasi-periodic kernel and infer a changein the properties of the active regions on the surface of TOI 451 between TESSCycles 1 and 3.

TESS re-observes the young multi-planet system TOI-451: refined ephemeris and activity evolution