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astro-ph.EP · Earth and Planetary Astrophysics

A local circular model gives a lower TESS secondary eclipse depth for TOI-1518 b in late 2024 than in 2022

We tested whether the optical secondary eclipse depth of TOI-1518 b changed between 2022 and late 2024. We fitted 57 eclipses in five public 120 s TESS SPOC light curves. The model uses a circular orbit, a uniform planet disk, fixed sector transit geometry, and a local quadratic baseline for each eclipse. The depths are 408.4 ppm in 2022, 371.3 ppm in early 2024, and 320.9 ppm in late 2024. Late 2024 minus 2022 is -87.6 ppm. Its conditional 95% interval is -158.0 to -18.6 ppm from 10000 resamples of complete eclipse windows within sectors. We report changes to the baseline, window size, flux product, geometry, model integration, and time grid. We also report event blocks, injected signals, and checks on repeated detectors. Off-eclipse templates give contrasts of -32.6 and -43.8 ppm, with intervals that contain zero. Their direction limits the interpretation of the primary contrast. The event intervals omit coherent instrument errors and full geometry uncertainty. This measurement does not establish a change in the planet atmosphere. The package contains the exact source files, fixed inputs, code, results, figures, and instructions to repeat the analysis.

TOI-1518 b · TESS · secondary eclipse · optical variability · event bootstrap · public data · reproducible analysis

Admitted 4 citing publications

References

11
  1. usesA shared circular model gives longer TOI-1518 b transits in late 2024 than in 2022 sci:sha256:32f6fa71ed85634abc061dfc9f3ac72c3bf689c70da13da1b5daad4d53f6d6d3

    We use its exact FITS files, source ledger, sector transit geometry, and ephemeris. We also use its coverage and projection method. We fit secondary eclipses in different exposures.

  2. Local fits to two-minute TESS light curves show wider TOI-1518 b transits in 2024 than in 2022 sci:sha256:de9930a1539eee59399106f04065b1723caf14b79199a1ba07484f57b58518ce

    This prior SCI study measured primary transit widening. It supplies context. We do not use its numerical inputs.

  3. usesdoi:10.17909/t9-nmc8-f686

    The five original 120 s SPOC light curves are part of this collection. We preserve their exact MAST product URIs and hashes.

  4. usesdoi:10.3847/1538-3881/ac1ba3

    This study measured the 2019 optical eclipse and phase curve. Its two harmonic amplitudes set the smooth-phase injection check. We use the 2019 depth for context.

  5. doi:10.1093/pasj/psae019

    This study measured a change in transit geometry. Our cited SCI input source uses its ephemeris.

  6. doi:10.1051/0004-6361/202453241

    Appendix A of this atmosphere study uses TESS data through sector 77 in an average transit fit.

  7. doi:10.48550/arXiv.2607.03992

    This study measures infrared emission spectra. It uses a different wavelength range and method from our optical eclipse fit.

  8. usesdoi:10.3847/1538-4357/ac7c74

    Astropy reads the original FITS products.

  9. usesdoi:10.1038/s41592-019-0686-2

    SciPy quadrature supplies an independent check of the analytic disk overlap.

  10. usesdoi:10.1038/s41586-020-2649-2

    NumPy supplies array operations, least squares, random draws, and numerical summaries.

  11. usesdoi:10.1109/MCSE.2007.55

    Matplotlib makes the figures from the saved results.

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