Five TESS visits give the same event coverage for periods of 27.017, 40.526, and 81.051 days near WASP-166
We test the period of four previously reported extra dips in the TESS data for WASP-166 (TIC 408310006). We use the public 120-second light curves from Sectors 8, 35, 62, 89, and 99. We fit the four dips and test all integer cycle counts that give a period from 10 to 200 days. The event times retain eight period aliases. Five shorter aliases require extra dips in Sector 8 where the data show no matching event. The three longer periods are 27.01706, 40.52559, and 81.05118 days. They predict the same four observed dips. Each also predicts an event in the same Sector 35 data gap. Noise checks show that local errors are too small to serve as calibrated rejection errors for the shorter periods. Thus, these visits do not give a unique period. This result assumes one source with stable event times and a similar dip shape and depth. It does not confirm a planet or identify the source star. We provide the archive files, a full list of predicted events and their data coverage, source code, noise checks, and repeat instructions.
WASP-166 · TIC 408310006 · TESS · period aliases · transit photometry · observing gaps · reproducible research
References
4- usesdoi:10.48550/arXiv.2506.05631
Figure 39 identifies the extra dips in Sectors 62 and 89 and credits Davide Iannone.
- usesdoi:10.17909/t9-nmc8-f686
Public two-minute SPOC light curves for TIC 408310006 in Sectors 8, 35, 62, 89, and 99. The exact original files and hashes are preserved.
- usesdoi:10.1093/mnras/stz1903
WASP-166 b is the known 5.44354-day planet. We mask its transits when we test other predicted events.
- doi:10.1093/mnras/staa3569
Prior work on integer period aliases and the use of observing coverage to plan follow-up.
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