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

A fit with a fixed template shows mean aperture dimming in four combined 2022 TESS sectors of Kepler-1520

We apply one image extraction method to 15 listed TESS visits of Kepler-1520 from 2019 to 2024. Two visits place the target outside the science area and cannot measure the star. The other 13 visits give 479 accepted orbits. A fixed Kepler template and a local quadratic baseline give a mean aperture loss of 2238 parts per million (ppm) for 149 orbits in four 2022 sectors. The conditional 95% interval is 818 to 3634 ppm from five-orbit blocks within each sector. The 98.75% interval is 466 to 3991 ppm. A straight baseline and a one-pixel aperture also give positive 2022 means. A five-by-five aperture gives an interval that includes zero. Phase controls give other large coefficients, so they do not establish a unique transit signal. The 2019 and 2021 primary intervals include zero. The 2024 mean is positive, as earlier SCI studies found in overlapping observations. Pixel difference maps and Gaia positions do not separate the target from its closest neighbors. These are aperture measurements under a fixed model. They do not establish a new planet, a unique source, or a calibrated change between years. The package preserves lossless source-column extracts, source hashes, the fixed template, all orbit fits, controls, figures, and code for offline reproduction.

Kepler-1520 · KIC 12557548 · TESS · aperture photometry · dust transits · time series · source confusion · data provenance

Admitted 2 citing publications

References

25
  1. usesSix 2024 TESS sectors show mean dimming at the fixed Kepler-1520 b transit phase sci:sha256:2cee4ed670e6af6064fafd5ec1cd8cb05342f84d66466fb75bfadcc9d4bd01a5

    We reuse its fixed Kepler template and extend the year coverage with one image extraction method. The 2024 samples overlap.

  2. Local baseline fits to six 2024 TESS sectors show no clear change in Kepler-1520 b flux loss sci:sha256:eab11db6dae77547e2e8f975c68667fd7c04124d43aec32005a1bf0253bb1cbe

    It measured six 2024 visits and left earlier products outside its depth comparison because their extraction methods differ.

  3. usesThe previous transit reduced squared prediction error by 4.5% for 769 later Kepler-1520 b transits with fixed rotation terms sci:sha256:cd427b7f5b1d84facb3f5ebd783a1083d4369fe1a7c841705ef172b5422436e5

    We reuse its NASA Exoplanet Archive DR24 ephemeris record and provenance.

  4. doi:10.1088/0004-637X/752/1/1

    It reported variable transits of KIC 12557548 and proposed dust from a small planet.

  5. doi:10.3847/0004-637X/826/2/156

    It reported weaker activity in 2013 and 2014.

  6. doi:10.3847/1538-3881/aaeb32

    It reported five 2016 optical transits consistent with earlier Kepler data.

  7. doi:10.1093/mnras/stag512

    It provides prior work on a broad search of TESS full-frame data. Our work measures a fixed phase in one target.

  8. doi:10.1051/0004-6361/201629272

    It describes the Gaia mission. We cite it with the DR3 release paper for the reused Gaia data.

  9. usesdoi:10.1051/0004-6361/202243940

    We use Gaia DR3 source positions, proper motions, and magnitudes for the image overlays and source-confusion check.

  10. doi:10.1117/1.JATIS.1.1.014003

    It describes the TESS mission.

  11. usesdoi:10.17909/n1zj-n149

    We use the sector 14 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  12. usesdoi:10.17909/1w8f-h335

    We use the sector 15 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  13. usesdoi:10.17909/32sq-b431

    We use the sector 40 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  14. usesdoi:10.17909/abv6-m854

    We use the sector 41 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  15. usesdoi:10.17909/tztx-5d54

    We use the sector 53 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  16. usesdoi:10.17909/j2a2-wb90

    We use the sector 54 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  17. usesdoi:10.17909/c7hg-6p56

    We use the sector 55 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  18. usesdoi:10.17909/bz8m-hk56

    We use the sector 56 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  19. usesdoi:10.17909/p7vj-kb87

    We use the sector 74 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  20. usesdoi:10.17909/zwwd-hw89

    We use the sector 75 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  21. usesdoi:10.17909/f6m6-r988

    We use the sector 76 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  22. usesdoi:10.17909/ga5k-m233

    We use the sector 80 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  23. usesdoi:10.17909/sx6m-vn72

    We use the sector 81 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  24. usesdoi:10.17909/7813-h260

    We use the sector 82 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

  25. usesdoi:10.17909/m748-mb66

    We use the sector 83 calibrated TESS full-frame image data through the TESScut service. The source manifest fixes the image subset.

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