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astro-ph.EP · Earth and Planetary Astrophysics

Local circular fits to 53 TESS eclipses leave the 2022 to 2024 change unresolved for KELT-1 b

KELT-1 b has known changes in its TESS eclipse depth. We tested these changes with a separate local baseline for each eclipse. We used all three public 120 s SPOC light curves in a frozen archive search: sectors 17, 57, and 84. Circular eclipse templates and quadratic baselines give 53 accepted events. Mean PDCSAP coefficients are 330, 147, and 199 parts per million (ppm) in 2019, 2022, and 2024. The 2024 minus 2022 coefficient is 52 ppm, with a 95% event-block interval from -73 to 173 ppm. The 2022 minus 2019 coefficient is -183 ppm. Its interval is close to zero at one end, and some fixed changes to the fit include zero. One control phase away from eclipse gives a larger apparent 2022 to 2024 change. Fixed synthetic orbital signals give false quadratic coefficients of 19 to 21 ppm, with less than 0.17 ppm change across visits for each signal. The local fits do not resolve a later change. They do not establish a physical cause for the earlier decrease. The package contains original data with hashes, all event decisions, code, figures, and an offline repeat check. The intervals assume that short blocks of accepted events describe the errors. They do not include an error shared by a full sector.

KELT-1 b · TESS · secondary eclipse · brown dwarf · photometry · local baseline · reproducible research

Admitted 2 citing publications

References

9
  1. usesdoi:10.17909/t9-nmc8-f686

    The three original TESS light curves are the observations in this study.

  2. usesdoi:10.1051/0004-6361/202244117

    Table 5 supplies the fixed circular eclipse geometry.

  3. usesdoi:10.17605/OSF.IO/WPJTN

    The ExoClock target page attributes the reference time and period to this source. We record the page values and source hash.

  4. doi:10.1051/0004-6361/202345937

    This prior work reports the 2019 to 2022 depth decrease. We test its dependence on a local fit.

  5. doi:10.5194/egusphere-egu26-23031

    This prior abstract reports changes across three TESS visits. Our work does not claim the first study of these visits.

  6. doi:10.1051/0004-6361/202038524

    This prior work describes eclipse and stellar signals. It warns that orbital curvature can bias a local eclipse depth.

  7. doi:10.3847/1538-3881/abb5aa

    This is prior TESS phase-curve work on KELT-1 b.

  8. usesdoi:10.1086/683602

    The batman software supplies primary transit templates for timing and depth controls.

  9. Local circular fits to 40 TESS eclipses do not resolve a mean depth change for KELT-20 b from 2019-2022 to 2024 sci:sha256:1f2571d64165342e8f232506e8c434619bb2cf54d3e29f0a3bbc66ccb9a6899e

    This local eclipse test for KELT-20 b provides related method context. We use new code and different observations.

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