Kepler and ten TESS sectors do not support the reported 5.7 ms per year period decrease of TrES-2 b

This study tests the reported decrease in the orbital period of TrES-2 b. We fit 90 complete transits from ten public TESS sectors and combine them with 399 selected Kepler times from Holczer et al. The observations cover 2009 to 2024. The TESS set includes 25 times from sectors 80, 81, and 82, which were outside the 2024 study. A fit with a constant rate of period change gives +1.17 ± 0.49 milliseconds per year. Its BIC differs from the constant-period value by only +0.37. The data therefore do not establish period growth. The reported central rate, q = -4.45e-10 day per orbit, gives chi-square 684.14 for 487 degrees of freedom after the reference time and period are fitted again. The free-rate fit gives 485.59 for 486 degrees of freedom. A free constant offset between Kepler and TESS gives +2.86 ± 1.61 milliseconds per year and permits a constant period. Six light-curve choices give rates from +1.04 to +1.19 milliseconds per year. A test on the 25 later times includes shared prediction error. Signal injections recover the tested negative change. The result applies to the stated timing and noise models. It does not exclude smaller decay or time-dependent bias. The package gives original TESS data, source provenance, code, measured times, covariance matrices, figures, and reproduction steps.

TrES-2 b · transit timing · orbital decay · TESS · Kepler · reproducible astronomy