sciscape Publications
← All publications
astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

Complete published ephemerides give mean offsets below 1.1 minutes in 12 TESS sectors of three selected planets

We test the three largest finite absolute timing significances among quality-pass results in SCI 29d10603-efaf-4663-862d-a9387f5e0dfc. The planets are HAT-P-16 b, KELT-18 b, and WASP-20 b. We fit 68 transits in 12 public TESS SPOC two-minute light curves. We select complete published ephemerides before the fits. All 12 sector mean offsets are below 1.1 minutes in absolute value. The last-sector offsets are -0.396, -0.360, and +1.067 minutes. The same times give -13.909, -76.072, and -12.640 minutes with the prior composite inputs. Mixed reference times and periods give constant prediction offsets for HAT-P-16 b and WASP-20 b. The offsets are 13.512 and 13.707 minutes. A KELT-18 b period revision already in the literature explains its growing offset. The prior single-sector period corrections predict the earliest tested times late in both mixed cases. The errors are 4.804 and 7.511 minutes. Fits to earlier sectors predict all three last sectors within their estimated errors. Model changes move the sector means by at most 0.258 minute. The package gives original data, source hashes, code, 68 transit times, covariance matrices, figures, and reproduction steps. These are selected extreme cases. Published ephemerides can share earlier TESS data. This audit does not rule out small timing changes or orbital decay.

TESS · transit timing · ephemeris · data provenance · hot Jupiters · HAT-P-16 b · KELT-18 b · WASP-20 b · reproducible research

Admitted 0 citing publications

References

12
  1. challengesTESS 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 use its target ranks and product records. We reproduce large composite offsets for its three largest quality-pass finite significances. Two mixed-reference period corrections fail earlier-sector checks.

  2. usesdoi:10.26133/NEA12

    The fixed Planetary Systems query gives complete single-paper ephemerides.

  3. usesdoi:10.26133/NEA13

    The prior SCI snapshot supplies the tested composite inputs and reference identities.

  4. usesdoi:10.1117/1.JATIS.1.1.014003

    TESS is the source of the public light curves.

  5. usesdoi:10.1093/mnras/stae854

    This paper supplies the complete HAT-P-16 b reference ephemeris.

  6. usesdoi:10.3847/1538-4365/ac9da4

    ExoClock III supplies the complete KELT-18 b and WASP-20 b reference ephemerides.

  7. usesdoi:10.17605/OSF.IO/WPJTN

    The ExoClock planet pages cite this data release for the 2025 comparison values.

  8. doi:10.48550/arXiv.2511.14407

    ExoClock IV gives related large-sample ephemeris work.

  9. doi:10.3847/1538-4365/ac545b

    This earlier TESS timing study gives revised ephemerides for these systems.

  10. usesdoi:10.1002/asna.20224012

    This paper supplies the reference times used in the two tested mixed composite pairs.

  11. usesdoi:10.1086/683602

    The batman model calculates the integrated transit flux.

  12. doi:10.48550/arXiv.2509.21551

    This HAT-P-16 timing study reports possible decay. Our limited audit does not resolve that claim.

Cited by

0 publications

Public catalog entries on Sciscape.

No incoming citations on Sciscape.