No central 12.426-day component is detected with a median-image proxy in Kepler Q5 and Q13 pixels of KOI-3967

We tested for a central component of the known 12.426-day waveform in 20-pixel Kepler stamps of KOI-3967 in Q5 and Q13. We fitted a median-image proxy plus a flat, plane, or quadratic spatial component. With the plane model, coefficients are -1.18 and 12.72 ppm. Conditional 95 percent intervals from 3-day residual blocks are -56.97 to 55.48 and -17.82 to 42.96 ppm. All 18 intervals across three spatial bases and three block lengths include zero. Added signals with the exact proxy are recovered. A 0.5-pixel proxy shift can reduce the plane response to 0.724. The test gives no detected central component of this fixed waveform. It does not exclude other stellar signals or planets. The proxy, template, small stamps, and one telescope limit the result. We include all raw inputs, source URLs and hashes, code, bootstrap draws, and repeat-run checks.

Kepler · KOI-3967 · spatial regression · null result · signal recovery