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Over the duration of the Kepler mission, KIC8462852 was observed to undergoirregularly shaped, aperiodic dips in flux of up to $\sim 20$\%. The dippingactivity can last for between 5 and 80 days. We characterize the object withhigh-resolution spectroscopy, spectral energy distribution fitting, radialvelocity measurements, high-resolution imaging, and Fourier analyses of theKepler light curve. We determine that KIC8462852 is a typical main-sequence F3V star that exhibits no significant IR excess, and has no very closeinteracting companions. In this paper, we describe various scenarios to explainthe dipping events observed in the Kepler light curve. We confirm that thedipping signals in the data are not caused by any instrumental or dataprocessing artifact, and thus are astrophysical in origin. We constructscenario-independent constraints on the size and location of a body in thesystem that is needed to reproduce the observations. We deliberate over severalassorted stellar and circumstellar astrophysical scenarios, most of which haveproblems explaining the data in hand. By considering the observationalconstraints on dust clumps in orbit around a normal main-sequence star, weconclude that the scenario most consistent with the data in hand is the passageof a family of exocomet or planetesimal fragments, all of which are associatedwith a single previous break-up event, possibly caused by tidal disruption orthermal processing. The minimum total mass associated with these fragmentslikely exceeds $10^{-6}$~\mearth, corresponding to an original rocky body of$>100$~km in diameter. We discuss the necessity of future observations to helpinterpret the system.

Planet Hunters X. KIC 8462852 - Where's the Flux?