A constant period fits 82 corrected TESS transit times of HAT-P-37 b from 2020 to 2024 under the adopted errors

We test a reported timing cycle in HAT-P-37 b. We use all 11 public TESS SPOC light curves with 120-second exposures returned by a target query on 2026 October 23. We remove periodic flux from a nearby binary with a separate model for each sector. Fixed coverage rules select 82 transits from 2020 June to 2024 September. A linear clock gives chi-square 75.62 for 80 degrees of freedom. At the reported angular rate of 0.0143 radians per transit, a free-phase sinusoid gives an amplitude of 0.51 minutes. Its 95% amplitude bound is 1.42 minutes under independent Gaussian timing errors. The reported central precession parameters imply about 1.67 minutes at this rate. With the reported phase fixed, the measured signed amplitude is 0.16 plus or minus 0.29 minutes. We test other transit shapes, binary corrections, and flux products. We preserve all source light curves, 82 transit times, coverage decisions, code, figures, and reproduction instructions. These results constrain the tested timing signal. They do not exclude all precession models or additional planets. The error model and the removal of binary flux remain necessary assumptions.

HAT-P-37 b · TESS · transit timing · apsidal precession · eclipsing binary · public data · reproducible research