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astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

Local TESS fits give a 2022–2024 eclipse depth change of 46 ± 59 ppm for TOI-2109 b with independent two-orbit blocks

We compare the mean optical secondary eclipse depth of TOI-2109 b in TESS sectors 52 (2022) and 79 (2024). Fixed coverage rules retain 48 eclipses. We fit SAP flux with an integrated eclipse shape and a local quadratic trend. We apply the nominal aperture dilution correction. The sector means are 864.20 and 910.36 ppm. The change is 46.16 ± 59.07 ppm, where the error is one standard error from independent two-orbit calendar blocks. The approximate 95% interval is −82.56 to +174.87 ppm. It includes zero in every planned fit and error-block test. Thus these local fits do not require a change. The interval assumes adequate trends, independent blocks, and independent sectors. A control at phase 0.75 gives a false depth of −115.80 ± 36.28 ppm in 2022. Both control differences between years include zero, but they do not prove that systematic errors cancel at eclipse. Independent geometry and fit checks agree with the production calculations. Injections recover added depth increments, but retain control offsets and do not establish interval coverage. We preserve the original public FITS files, provenance, all coverage decisions, event fits, source code, figures, and reproduction instructions. This is a conditional comparison of a local depth observable. It does not establish constant physical brightness or test variability against the sector 25 full orbit result.

TOI-2109 b · TESS · secondary eclipse · optical photometry · eclipse depth · time variability · local trend · reproducible data

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References

8
  1. usesLocal fits to 45 TESS transits preserve the 115-day wave preference in TOI-2109 b timing data with a constant-period clock and independent errors sci:sha256:30f588729bc4344f0e7b6d47117239c84880ff6fd857dc2f9c8ebd4e43f426bf

    This verified publication supplied the original frozen public TESS FITS files and product provenance. Direct MAST downloads match both hashes. Our eclipse code and measurements are new.

  2. usesdoi:10.3847/1538-3881/ac26bd

    Table 8 supplies the reference clock, discovery geometry, phase model, and stellar mode values. Its sector 25 depth is context only.

  3. usesdoi:10.1051/0004-6361/202451068

    Table 3 supplies the fixed TESS geometry. We read arXiv:2411.07797v1.

  4. doi:10.48550/arXiv.2505.18941

    We reviewed version 2 for prior use of sectors 25, 52, and 79 in transit timing.

  5. doi:10.48550/arXiv.2609.26894

    We reviewed version 1 for later TESS, HST, and JWST transit timing work and the stated scope of future atmosphere results.

  6. usesdoi:10.1086/683602

    The batman package supplies the exposure-integrated secondary eclipse template.

  7. usesdoi:10.1117/1.JATIS.1.1.014003

    The TESS mission collected the public photometry.

  8. usesdoi:10.1117/12.2233418

    SPOC made the input light curve products.

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