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We present the detection of the progenitor of the Type II SN 2011dh inarchival pre-explosion Hubble Space Telescope images. Using post-explosionAdaptive Optics imaging with Gemini NIRI+ALTAIR, the position of the SN in thepre-explosion images was determined to within 23mas. The progenitor object wasfound to be consistent with a F8 supergiant star (log L/L_{\odot}=4.92+/-0.20and T_{eff}=6000+/-280K). Through comparison with stellar evolution tracks,this corresponds to a single star at the end of core C-burning with an initialmass of M_{ZAMS}=13+/-3M_{\odot}. The possibility of the progenitor sourcebeing a cluster is rejected, on the basis of: 1) the source is not spatiallyextended; 2) the absence of excess H\alpha\, emission; and 3) the poor fit tosynthetic cluster SEDs. It is unclear if a binary companion is contributing tothe observed SED, although given the excellent correspondence of the observedphotometry to a single star SED we suggest the companion does not contributesignificantly. Early photometric and spectroscopic observations show fastevolution similar to the transitional Type IIb SN 2008ax, and suggest that alarge amount of the progenitor's hydrogen envelope was removed beforeexplosion.

The Yellow Supergiant Progenitor of the Type II Supernova 2011dh in M51