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We obtained late-time optical and near-IR imaging of SN 2008S with the LargeBinocular Telescope (LBT). We find that (1) it is again invisible at optical(UBVR) wavelengths to magnitude limits of approximately 25 mag, and (2) whiledetected in the near-IR (HK) at approximately 20 mag, it is fading rapidly. Thenear-IR detections in March and May 2010 are consistent with dust emission at ablackbody temperature of T ~ 900 K and a total luminosity of L ~ 40000 Lsun,comparable to the luminosity of the obscured progenitor star. If it is asupernova, the near-IR emission is likely due to shock heated dust since theelapsed time from peak is too long to support a near-IR dust echo and thedecline in luminosity is shallower than the 56Co slope. If it is reprocessedemission from a surviving progenitor, a dust photosphere must havereestablished itself closer to the star than before the transient (~40 AUrather than 150 AU), unless there is a second, cooler dust component thatdominates at mid-IR wavelengths. The continued rapid fading at roughly constanttemperature favors transient emission, but the SED peaks in the mid-IR andfuture Spitzer observations will be needed to close the case.

The SN 2008S Progenitor Star: Gone or Again Self-Obscured?