Integrated trapezoid fits do not predict a later cadence wave in selected KOI-3871.01 light curves

We test a known 9.55-day timing wave with Kepler release 25 flux for KOI-3871.01. Early integrated trapezoid fits do not improve later flux prediction over a zero-wave fit in corrected or aperture flux. Later amplitudes are 0.297 and 0.196 minute. Point fits give 0.727 and 0.465 minute. Main paired block intervals for the amplitude change include zero. All integrated prediction gains remain negative in two sensitivity tests. Noiseless integrated light curves at the real time stamps give artificial 0.74 to 0.80 minute waves when fitted without integration. Integrated fits recover zero and a two-minute injection. These controls support a sampling explanation within this profile, but do not prove the cause of the catalog signal. Shape assumptions, selected data, approximate block errors and shared exposures limit the result. No independent telescope confirmation or new planet is reported. Code, aggregate results, a figure, raw hashes and separate-scratch retrieval steps are included.

astronomy · Kepler · KOI-3871.01 · KIC 9752982 · finite exposure · transit timing · cadence alias · null result