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We have assembled new Spitzer Space Telescope Infrared Array Cameraobservations of the mysterious binary star Epsilon Aurigae, along with archivalfar-ultraviolet to mid-infrared data, to form an unprecedented spectral energydistribution spanning three orders of magnitude in wavelength from 0.1 micronsto 100 microns. The observed spectral energy distribution can be reproducedusing a three component model consisting of a 2.2+0.9/-0.8 Msun F typepost-asymptotic giant branch star, and a 5.9+/-0.8 Msun B5+/-1 type mainsequence star that is surrounded by a geometrically thick, but partiallytransparent, disk of gas and dust. At the nominal HIPPARCOS parallax distanceof 625 pc, the model normalization yields a radius of 135+/-5 Rsun for the Fstar, consistent with published interferometric observations. The dusty disk isconstrained to be viewed at an inclination of i > 87 deg, and has effectivetemperature of 550+/-50 K with an outer radius of 3.8 AU and a thickness of0.95 AU. The dust content of the disk must be largely confined to grains largerthan ~10 microns in order to produce the observed gray optical-infraredeclipses and the lack of broad dust emission features in the archival Spitzermid-infrared spectra. The total mass of the disk, even considering a potentialgaseous contribution in addition to the dust that produces the observedinfrared excess, is << 1 Msun. We discuss evolutionary scenarios for thissystem that could lead to the current status of the stellar components andsuggests possibilities for its future evolution, as well as potentialobservational tests of our model.

Taming the Invisible Monster: System Parameter Constraints for Epsilon Aurigae from the Far-Ultraviolet to the Mid-Infrared