KOI-2700 core transit loss decreases within all four Kepler detector seasons in Q1 to Q16

We test whether fixed annual detector offsets explain the known decline of the KOI-2700 dusty transit. We measure 1,148 accepted orbits in Kepler release 25 quarters 1 to 16. A fit to 16 quarter means with four detector-season offsets gives an aperture core-loss slope of -63.67 ppm per year. An approximate quarter-level wild interval is [-97.36, -29.98] ppm per year. All four separate season slopes are negative. Corrected flux and header-based crowding correction retain the decline. Twelve period, baseline and product choices give negative slopes with conditional intervals below zero. A fixed synthetic signal on the actual sampling gives a slope of +0.84 ppm per year. This test supports the known decline against fixed season offsets only. Time-dependent contamination, shared annual errors and transit-shape changes remain possible. The two flux products share exposures. Prior independent TESS data do not confirm the transit at the required sensitivity. No new planet or signal is claimed.

astronomy · KOI-2700 · Kepler · dust tail · detector seasons · transit decline · instrument checks