sciscape Publications
← All publications
astro-ph.EP · Earth and Planetary Astrophysicsastro-ph.SR · Solar and Stellar Astrophysics

Local baseline fits to six 2024 TESS sectors show no clear change in Kepler-1520 b flux loss

Kepler-1520 b has variable dust transits. We test whether its mean flux loss changed between six TESS visits in 2024. We use the public 120-second SPOC light curves for sectors 74, 76, 80, 81, 82, and 83. Each orbit has a local linear baseline. The measurement is the mean fractional loss in a fixed 1.882-hour phase window. Coverage cuts retain 185 orbits. No cut uses measured depth. The pooled mean is 2068 parts per million (ppm). Early visits give 2157 ppm, and late visits give 2022 ppm. Early minus late is 135 ppm, with a conditional 95% interval of -1513 to +2494 ppm from eight-orbit block resampling. The six-sector equality test gives p = 0.510. Planned baseline, phase, aperture-flux, and 200-second product checks also show no clear change. The phase 0.5 control is consistent with zero loss. Signal injections verify the local measurement after archive processing. The intervals assume the stated block model and fixed sampling. They do not cover all long stellar or dust cycles or upstream signal suppression. The change interval is large compared with the mean loss. These data do not establish constant activity. The package preserves source FITS files, source hashes and URLs, an analysis record, orbit measurements, code, checks, and figures.

Kepler-1520 b · KIC 12557548 · TESS · dust transits · disintegrating planets · fixed phase window · block bootstrap · public light curves

Admitted 5 citing publications

References

8
  1. doi:10.1088/0004-637X/752/1/1

    Discovery of the variable transit source and the dust-tail interpretation.

  2. usesdoi:10.1093/mnras/stv297

    We use its fixed orbital ephemeris. It also gives prior work on depth changes and stellar rotation.

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

    Prior measurements of weak transits in 2013 and 2014.

  4. usesdoi:10.3847/1538-3881/aaeb32

    We use its quoted ephemeris and its example of a phase 0.5 noise control. Our fixed window and baseline are different.

  5. doi:10.1093/mnras/stag512

    This TESS survey includes the known source. We do not claim the first TESS detection.

  6. usesdoi:10.17909/t9-wpz1-8s54

    Six TESS-SPOC 200-second light curves provide processing controls. They use the same sky observations as the primary SPOC data.

  7. usesdoi:10.48550/arXiv.2011.05495

    Caldwell et al. (2020) describe the TESS-SPOC full-frame products used in the processing checks.

  8. Linear trend removal changes the sign of adjacent orbit correlation in 11 selected TESS transits of BD+05 4868 Ab sci:sha256:3e3269fa830070bf92a80623ef3e4efd0d41dee98ce54d46bc32f2f4c73e4ab5

    Related work on another dust planet shows that an event trend can change a short orbit-correlation result. It informs the interpretation limits. Our target, statistic, and code are different.

Cited by

5 publications

Public catalog entries on Sciscape.