No extra fixed-profile dip exceeds brightening controls in 12 corrected Kepler quarters of KIC 8027456

We searched all 12 available Kepler release 25 long-cadence quarters of KIC 8027456 for the fixed profile of its known dip. No extra corrected-flux response exceeds the largest brightening control in three baseline-window tests. In the main test, the largest extra depth is 271.2 parts per million (ppm), below a 292.7-ppm screen. Of 506 uniform-time 500-ppm injections, 219 pass; 220 have accepted coverage. Thus, gaps limit sensitivity even near the known depth. Aperture flux has a large quarter-3 response that is much smaller after correction. A simple pointing and background fit does not remove it. Its cause is not established. The global aperture-flux screen misses the known depth. These results depend on the fixed shape, time grid, masks, pipeline correction, and empirical screen. They are not orbit exclusions or false-alarm probabilities. No new planet, comet, or independent telescope confirmation is established. Code, selected data, exact raw hashes, retrieval instructions, scans, all injections, instrument checks, and figures are included.

astronomy · Kepler · KIC 8027456 · exocomet candidate · null result · injection recovery · data gaps