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Four 2025 TESS transits of TOI-201 b are about 27 minutes late relative to a 2018–2021 linear clock

We measure four TOI-201 b transits in public TESS sectors 94, 96, 97, and 98. These events occurred from July to December 2025. We fit each event with a transit model and a local flux baseline. We compare the times with a linear clock fitted to 11 published events from 2018 to 2021. The four delays are 25.92 to 27.09 minutes. At transit number 48.5, the fitted delay is 26.59 ± 1.55 minutes. The new mean interval is 52.9784589 ± 0.0001904 days. It does not show a clear change from the early interval. The mean chord duration is 246.87 minutes. Its statistical error is 0.65 minutes, with a shared model sensitivity of 1.52 minutes. These data do not resolve a small duration change. A control event agrees with its published time. We preserve the original FITS files, checksums, code, figures, and noise tests. The contribution is four later event measurements and a reproducible data package. The known timing variation was reported before this work. We do not infer a new planet or test a full model of the system orbits.

TOI-201 b · TESS · transit timing · transit duration · public data · reproducible measurements

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References

7
  1. usesdoi:10.3847/2041-8213/adefe5

    We use the 15 published transit times, their errors, the transit shape coefficients, and the planned later TESS observations.

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    This paper gives a model of the known system and its changing orbits.

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    We use public observations from the TESS mission.

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    We use the MAST collection of two-minute TESS light curves. Exact products and checksums are in the data record.

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    We use light curves from the TESS Science Processing Operations Center.

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