The source estimate for TOI-7102/7157 changes with the image and pointing models in three TESS sectors

We tested the source of the shared transit-like signal in TOI-7102 and TOI-7157 with public TESS pixel data from sectors 76, 77, and 84. The stars are 4.80 arcseconds apart. An earlier public report assigned the signal to TOI-7157. We give an independent sensitivity test with circular and elliptical Gaussian images, the released TESS pixel response function (PRF), and local baselines with or without image-shift terms. We use 55 accepted events and preserve all 36 image, baseline, and fit-box combinations. In sector 84, the fitted lost-light share for TOI-7157 changes from 0.90 to 1.95 when shift terms are added to the PRF baseline. A share above one is outside the physical range of a two-source loss model. All three tested image shapes show this effect. PRF signal injections recover the host amplitude within 1.12%, with cross-talk below 0.90%. A chosen local template shift of 0.05 pixel changes the share by 0.15–0.33. These tests do not establish one host star or validate a planet. Bootstrap ranges keep the image model fixed and do not include its errors. The package contains lossless analysis inputs, source URLs and hashes, PRF files, code, results, figures, and commands for offline reproduction.

TESS · TOI-7102 · TOI-7157 · transit source · pixel response function · model sensitivity · reproducible astronomy