The 0.911-day dip in the TOI-2640 field is weaker in TESS Sector 90 than in Sectors 36 and 37 for a two-hour template

We tested whether the strong 2021 dip in the TOI-2640 field repeats in later public TESS data. We used four SPOC two-minute light curves and their pixel files. A triangle with a full width of 2.003 hours measures loss at a period of 0.9112206 days. At catalog phase, the fitted corrected-flux depths are 9.20% ± 0.75% and 8.10% ± 1.30% in Sectors 36 and 37. They are -0.64% ± 0.79% and 0.47% ± 0.79% in Sectors 90 and 99. Errors describe scatter between orbital cycles. Raw aperture flux and four independent circular pixel sums show the same change at catalog phase. In Sector 90, a search over 180 phases and seven periods within three catalog period errors finds a largest SAP loss of 0.001175. Under the archive dilution estimate, this gives a target-scaled depth of 1.94%. All 60 trial-phase additions of a catalog-depth dip are recovered above five estimated standard errors at their known phases. Sector 99 has a weaker shifted feature and lower recovery power. Hord et al. (2024) already labeled this target a likely false positive. The contribution is the measured change between visits and a reproducible test of recurrence. The physical cause and unique host remain unknown. The result applies to the stated template and period range. We preserve compact data, exact archive product hashes, source code, full search tables, four figures, and instructions for offline and full-data reproduction.

TESS · TOI-2640 · TIC 135036669 · transit candidates · signal recurrence · variable stars · public data · reproducible research