Fixed transit and baseline rules give 24% coverage of a Gaussian timing model for HD 88986 b in TESS sector 48

TESS sector 48 can test 24.2% of a stated Gaussian transit timing model for HD 88986 b under fixed transit and baseline rules. The model advances the reported sector 21 event by five cycles. It has a mean of BTJD 2621.940 and a width of 2.075 days. We use public 120-second SPOC data and a fixed 239 ppm transit template. A valid fit needs at least 80% transit sampling and 50% sampling on each side for a local baseline. Transit sampling alone covers 42.3% of the timing model. Three baseline settings give 17.2% to 28.5% valid coverage. A finer grid changes the main value by 0.14 percentage points. A template added at known control times passes an empirical amplitude threshold at 90.9% of valid control times. When each trial time is weighted by the Gaussian model, valid injected passes cover 23.2% of its full mass. These additions enter the delivered light curve after archive processing. They do not measure signal loss in that processing or the power of a blind search. This study supplies a map of test times, six input light curves, archive records, code, figures, and repeatability checks. It does not establish the transit status of the planet. The timing model is an approximation to published marginal values. The result excludes the CHEOPS observations that cover part of the TESS gap.

HD 88986 b · TESS · transit timing · observing window · signal injection · reproducible analysis