External Photoevaporation of Disks around Low Mass Young Stellar and Sub-Stellar Objects
External UV environment of stellar nurseries plays a major role on evolution of protoplanetary disks around young stellar objects. Photoevaporating protoplanetary disks (proplyds) have been found mainly around O stars in strong radiation environments, most of which are found in the Orion Nebula Cluster. However our recent studies also found proplyds in immediate vicinity of B stars, which implies that intermediate UV radiation environment can also affect disk evolution of young stellar objects, and potentially planet formation in such disks. We present our recent studies of proplyds around low mass young stellar- and sub-stellar objects, some of which may be potentially forming free-floating planetary mass objects. We will present our findings of the proplyds in NGC 1977 and NGC 2024, and show some selected proplyds around low mass sub-stellar objects. We will discuss the implication and the role of external UV environment in star and planet formation.