  Most low-mass stars form in stellar clusters that also contain massive stars,
which are sources of far-ultraviolet (FUV) radiation. Theoretical models
predict that this FUV radiation produces photo-dissociation regions (PDRs) on
the surfaces of protoplanetary disks around low-mass stars, impacting planet
formation within the disks. We report JWST and Atacama Large Millimetere Array
observations of a FUV-irradiated protoplanetary disk in the Orion Nebula.
Emission lines are detected from the PDR; modelling their kinematics and
excitation allows us to constrain the physical conditions within the gas. We
quantify the mass-loss rate induced by the FUV irradiation, finding it is
sufficient to remove gas from the disk in less than a million years. This is
rapid enough to affect giant planet formation in the disk.
