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

Four recovered WASP-108 b discovery transits occur 2.7 min after TESS predictions with the assumed phase origin and time conversion

We test the historical timing difference of WASP-108 b with the discovery light curves. We recover 881 follow-up data bins from seven nights and 9018 model vertices from the vector source of Figure 2 in arXiv:1410.3449v2. Four nights have data at least 10 min outside each side of the reported transit. We fit their phases with separate flux baselines and depth scales. We compare them with a constant-period fit to 48 reused TESS times from 2019 to 2026. If the plotted phase uses the reported discovery epoch and period, and a +68.256 s time conversion applies, the four nights give an offset of +2.75 +/- 0.55 min. The conditional 95% interval is +1.67 to +3.82 min. Tested baseline, profile-width, and bin-average choices give offsets from +2.50 to +2.96 min. The period from the four relative phases differs from the TESS period by -0.340 +/- 0.359 s. Thus, these relative phases do not show a different period. The source has inconsistent time labels and lacks original exposure records, bin weights, and errors. The result preserves a historical phase dataset and shows that several plotted nights retain the conditional time difference. It does not establish orbital change. The package includes integer source coordinates, data provenance, source code, figures, full results, numerical checks, and reproduction instructions.

WASP-108 b · transit timing · historical photometry · data recovery · time systems · TESS · reproducible research

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References

7
  1. usesA constant period fits 48 TESS transit times of WASP-108 b from 2019 to 2026 under the tested error models sci:sha256:e16b1f7870033eff5b9219fe66ac9f0b02c2f955889a62943d8f2d9ba93ffe1e

    We reuse its 48 primary TESS transit times and errors, refit their constant-period clock, and test the unresolved historical time comparison with recovered discovery curves.

  2. Joint 2022 ephemerides predict later TESS times more accurately than the 2026 archive composite values for 83 of 92 hot Jupiters sci:sha256:bdb906c50c677c7cf55e60c7368b884b6dc21fa1e8b7e9576e90a706b25e4899

    This study found the TESS offset that selected the target for the parent timing investigation.

  3. usesdoi:10.48550/arXiv.1410.3449

    We recover data markers and model vertices from the version 2 Figure 2 vector source and use Tables 1, 2, and 6 for night order, labels, and the conditional phase map.

  4. usesdoi:10.3847/1538-4365/ac545b

    Its fixed reference clock defines the reused TESS residuals. Its converted discovery epoch supplies the adopted +68.256 s convention.

  5. doi:10.1002/asna.20224012

    This earlier TESS study reported a timing difference from the discovery prediction. We do not claim the first such difference.

  6. doi:10.48550/arXiv.2006.01587

    This study lists three later ground-based transit times. Those observations are outside our discovery-figure scope.

  7. doi:10.17909/t9-nmc8-f686

    TESS data collection used by the parent publication. No new TESS photon analysis is made here.

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