At the DR24 epoch, a published Kepler profile has unequal core and tail scales in six 2024 TESS sectors

We tested a published Kepler profile in six 2024 TESS sectors of the known planet Kepler-1520 b. We used the DR24 epoch and period. Each orbit had its own baseline and two profile scales. The split was at phase +0.02. In 178 accepted orbits, the tail scale minus the core scale is -6132 parts per million (ppm). The approximate 95% sector interval is -9642 to -2623 ppm. Curved baselines and aperture flux give similar results. The tail-to-core coefficient ratio is -0.285, with Fieller interval -1.636 to +0.550. These are empirical profile scales. They do not measure a dust mass ratio. A template epoch 9.4 minutes earlier gives a contrast interval of -4440 to +1084 ppm. An added diagnostic grid holds orbit selection fixed and shows the timing dependence. We do not adopt a new epoch. The shift exceeds the archive formal timing standard deviation. Later Kepler quarters also show a smaller mismatch with the early profile. Splits at phases +0.06 and +0.10 leave the later tail scale unresolved. The evidence rejects a common mean scale for the specified fixed profile, timing, and uncertainty model. It does not identify a physical change in the dust tail. The package preserves source data, provenance, code, coefficients, covariance estimates, controls, figures, numerical checks, and offline reproduction instructions.

Kepler-1520 b · KIC 12557548 · TIC 417679385 · TESS · Kepler · transit profile · dust tail · ephemeris · public data · reproducible research