Four TESS sectors do not establish a linear transit width change for MASCARA-4 b from 2021 to 2025

We test whether the transit width of MASCARA-4 b changes in four public TESS sectors from 2021 to 2025. We fit 34 complete transits at a common 120 s cadence. Each fit has a free center, depth, background, and time scale of a fixed profile. The width at half depth has a slope of 0.159 +/- 0.061 minute per year under the local fit error model. Aperture flux, a quadratic background, and two other profiles give slopes from 0.154 to 0.185 minute per year. A check with four sector means gives a slope of 0.154 minute per year. Its nominal 95% Student t interval is -0.157 to 0.464 minute per year, with two degrees of freedom. The interval includes zero. Separate smooth profiles also have larger widths in the two later sectors. Residual shifts and synthetic transits test the fit response. They cannot exclude errors shared by a sector. The data show a small apparent increase but do not establish a physical duration change or orbital precession. The package contains the original light curves, source hashes, event tables, code, figures, and reproduction instructions.

MASCARA-4 b · TIC 371443216 · TESS · transit width · public astronomical data · residual correlation · reproducible analysis