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We present the discovery with WISE of a significant infrared excessassociated with the eclipsing post-common envelope binary SDSSJ030308.35+005443.7, the first excess discovered around a non-interacting whitedwarf+main sequence M dwarf binary. The spectral energy distribution of thewhite dwarf+M dwarf companion shows significant excess longwards of 3-microns.A T_eff of 8940K for the white dwarf is consistent with a cooling age >2 Gyr,implying that the excess may be due to a recently formed circumbinary dust diskof material that extends from the tidal truncation radius of the binary at 1.96Rsun out to <0.8 AU, with a total mass of ~10^20 g. We also construct WISE andfollow-up ground-based near-infrared light curves of the system, and findvariability in the K-band that appears to be in phase with ellipsoidalvariations observed in the visible. The presence of dust might be due to a)material being generated by the destruction of small rocky bodies that arebeing perturbed by an unseen planetary system or b) dust condensing from thecompanion's wind. The high inclination of this system, and the presence ofdust, make it an attractive target for M dwarf transit surveys and long termphotometric monitoring.

The WIRED Survey III: An Infrared Excess around the Eclipsing Post-Common Envelope Binary SDSS J030308.35+005443.7