An exponential dust model gives 0.40 to 0.54 day decay times for the known KIC 8027456 dip in 36 local fits

We tested a narrow exponential dust ribbon for the known Kepler dip of KIC 8027456 near BKJD 1448.9. A central chord model gives decay times of 0.400 to 0.539 day across 36 flux, baseline, window and intensity choices. Main aperture and corrected flux fits give 0.532 and 0.521 day and lower squared residual sums than a split Gaussian with the same parameter count. Conditional residual-block intervals span about 0.38 to 0.70 day. Adding the fitted dips to 20 real off-event windows per product gives recovered decay times from 0.354 to 0.737 day. These controls overlap and do not give a false-alarm probability. The result supports this restricted dust model as a useful description. It does not establish dust as the cause or measure a grain lifetime. Both products share observations. Blends, stellar changes and untested detector effects remain possible. No new object or independent telescope confirmation is reported. Code, exact source hashes, local flux vectors, all fits, noise tests, figures and retrieval instructions are included.

astronomy · Kepler · KIC 8027456 · HD 182952 · exocomet candidate · dust model · parameter recovery