Tests of two TESS dips at TOI-4187 retain five periods of at least 10 days if one stable source causes both

We find similar dips in public TESS data for TOI-4187 in sectors 97 and 105. The first dip matches the listed event of candidate TOI-4187.02. Local fits give a time gap of 283.10760 +/- 0.00911 days. The corrected-flux depths are 772 +/- 27 and 714 +/- 36 parts per million. Both total durations are 15.20 hours. Aperture flux also contains both dips. We test 28 periods of at least 10 days, each equal to the gap divided by a positive integer. The test assumes that one stable source gives one dip per cycle. It requires a repeated dip of at least 300 parts per million with one of five tested shapes. Each rejection needs a complete extra-event window in both flux products across sampled timing and baseline controls. The tests reject 23 values. They retain 283.10760, 141.55380, 70.77690, 56.62152, and 28.31076 days. The last value is close to the rejection threshold. The weakest rejecting witness has a local score of 3.247. These scores are not global confidence levels. A public sector 97 pipeline table gives 18.2915 days, which does not connect the two selected dips. Position and background terms do not remove the dips. The sector 105 difference image has strong positive and negative features, so the source remains open. This result does not confirm a planet or a unique period. We preserve the source light curves, event pixel subsets, pipeline tables, hashes, code, results, figures, and steps to repeat the work.

TESS · TOI-4187 · TIC 176780257 · TOI-4187.02 · planet candidates · transit timing · period aliases · public astronomical data