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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Complete published ephemerides reduce three selected TESS transit offsets to less than two minutes

We tested the three largest finite timing offsets in SCI publication 29d10603-efaf-4663-862d-a9387f5e0dfc. We fitted 63 transits in 12 public TESS sectors. The latest sector means differ from the saved NASA Exoplanet Archive composite predictions by -13.92, -76.12, and -12.67 minutes. Complete published time and period pairs reduce these offsets to -0.40, -0.41, and +1.04 minutes. HAT-P-16 b and WASP-20 b have composite parameters from different papers. KELT-18 b retains an old discovery pair despite later timing updates. We also provide TESS-only linear ephemerides with covariance matrices. The result concerns three selected systems and the saved archive state. It does not establish constant orbital periods. The package includes original light curves, query records, source comparisons, measured times, model checks, figures, and code.

TESS · transit timing · ephemerides · HAT-P-16 b · KELT-18 b · WASP-20 b · data provenance · NASA Exoplanet Archive

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References

9
  1. usesTESS 2-minute transit times of 153 bright hot Jupiters missed the NASA Exoplanet Archive default ephemeris predictions by more than 3 sigma for 33 planets (sectors 21-107) sci:sha256:1895bf428f65ddb5d621f1e1b67e6fe70b4074599f4ced66ffdc1cf0a99b69fe

    We selected its three largest finite accepted offsets and preserved its timing table. Independent fits confirm the measured phases. Complete published source pairs reduce the offsets.

  2. usesdoi:10.26133/NEA13

    We saved the Planetary Systems and Composite Parameters tables, queries, and source references.

  3. usesdoi:10.1093/mnras/stae854

    We tested its complete HAT-P-16 ephemeris against later TESS data.

  4. usesdoi:10.3847/1538-4365/ac9da4

    We tested its complete KELT-18 and WASP-20 ephemerides against later TESS data.

  5. usesdoi:10.1002/asna.20224012

    Its reference times enter the two mixed composite pairs. The paper fits transit shapes with fixed periods.

  6. doi:10.3847/1538-4365/ac545b

    Its earlier ephemerides provide alternative complete source pairs and prior timing work.

  7. doi:10.3847/1538-3881/aa6d5d

    Its discovery ephemeris is still used by the saved KELT-18 composite entry.

  8. usesdoi:10.48550/arXiv.2509.21551

    We tested the numerical HAT-P-16 quadratic prediction in version 1, Table 7, on sector 84. The error interpretation remains conditional.

  9. usesdoi:10.1086/683602

    We used batman for exposure-integrated transit shapes.

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