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astro-ph.EP · Earth and Planetary Astrophysics

Local TESS eclipse fits give a Kepler-13 Ab depth slope interval that includes zero for 2019–2024

We tested a linear change in the secondary eclipse depth of Kepler-13 Ab. Twelve public TESS sectors from 2019 to 2024 contain 143 eclipses that pass fixed coverage rules. Each local fit solves a polynomial baseline and a fixed uniform-disk eclipse depth together. The primary PDC slope is +1.68 parts per million per year. Its 95 percent interval is -66.52 to +69.88 parts per million per year. This interval uses five year means and assumes independent normal year errors with a common variance about a line. All ten choices of flux product, baseline, window, profile width, and center give intervals that include zero. Eclipse-to-transit depth ratios also give intervals that include zero. The 2024 minus 2019 depth difference is +70.61 parts per million, with an event bootstrap interval of -37.04 to +180.13. In 500 residual-rotation trials, the primary interval contains either an added zero slope or an added 20 parts per million per year slope in 483 trials. It detects the added nonzero slope in only 126 trials. These tests do not establish constant dayside brightness and do not bound coherent instrumental errors. The package contains original FITS files, verified source records, new eclipse tables, source code, figures, recovery trials, and instructions for a new run.

Kepler-13 Ab · TESS · secondary eclipse · dayside brightness · time series · public data · reproducible research

Admitted 1 citing publication

References

6
  1. usesFits to twelve TESS sectors give weak evidence for wider Kepler-13 Ab transits from 2019 to 2024 sci:sha256:f9b264bff4f611658126764118a28615c43657e8d05586641f30c6aa3cec4d35

    We reuse its verified original FITS files, raw source hashes, sector metadata, and transit-depth fits for a new secondary eclipse test.

  2. A fixed profile test gives a Kepler-13 Ab asymmetry slope interval that includes zero for 2019–2024 sci:sha256:dc8818e7aa180e8f6983ae9c7d8a4e1f452479a993c42550cdc2cfc435d34701

    This prior work tests a transit asymmetry component in the same data interval. The present test measures secondary eclipse depths.

  3. doi:10.3847/1538-3881/ac0c7d

    This prior full-orbit TESS study measures the eclipse depth in sectors 14, 15, and 26. We test later data with local fits.

  4. usesdoi:10.17909/t9-nmc8-f686

    The original TESS 2-minute light curve collection provides all observations.

  5. usesdoi:10.1093/mnras/stab701

    Its period and transit epoch, as recorded by the source SCI work, set our event windows.

  6. doi:10.1093/mnrasl/slz177

    A changing transit chord and stellar surface brightness limit the use of transit depths to correct dilution.

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