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The photoevaporation of circumstellar disks is a powerful process in the diskdissipation at the origin of the Orion proplyds. This Letter reports the firstdetection of a photoevaporating disk in the final but long-lasting phase of itsevolution. The disk is associated to a low-mass T Tauri member of the sigmaOrionis Cluster. It is characterized by a very low (if any) accretion rate andby a tenuous (Mloss ~ 10^{-9} Msun/yr) photoevaporation wind, which isunambiguously detected in the optical spectrum of the object. The wind emitsstrong forbidden lines of [SII] and [NII] because the low-mass star is close toa powerful source of ionizing photons, the O9.5 star sigma Ori.

Discovery of an old photoevaporating disk in sigma Orionis