A quadratic fit to 2019–2024 TESS times does not resolve the reported period increase of Qatar-1 b

We test the reported constant period increase of Qatar-1 b with 2019–2024 TESS data. A common transit shape fit gives 290 times from 20 sectors at native 120 s cadence. Coverage rules retain events without a cut on measured transit time. Residual block resampling sets event errors. A quadratic clock gives +2.85 ± 9.91 ms per Julian year, with the error from sector removal. The nominal 95 percent interval is −17.89 to +23.59 ms per year. Wild sector tests give p = 0.759 for zero and p = 0.596 for the reported +7.60 rate. The Bayesian information criterion (BIC) prefers a constant period by 5.53. After the reference time and period are fitted, the +7.60 signal has a weighted root mean square of 2.39 s. Its expected signal to noise ratio is 0.98 under fixed independent event errors. Thus this sample neither detects nor excludes the reported central rate. The package preserves the exact input files, provenance, source code, timing table, coverage ledger, resamples, checks, and figures. This is a new measurement and validation study of public observations already used in prior work. Its result depends on a common transit shape, a constant quadratic clock, and the stated noise assumptions.

Qatar-1 b · TESS · transit timing · orbital period change · correlated noise · reproducible data