JWST
"These planets are difficult to study as they can only be viewed via ultraviolet light. The researchers hope to continue observing GJ347b using Hubble and eventually the James Webb Telescope..."
If they can only be observed via ultraviolet light then the James Webb Space Telescope won't be able to see them because its sensors will only operate in the Red to mid-infrared range and because it's going to be located at the Sun-Earth L2 point there won't be any possibility of adding a UV detection capability in the foreseeable future. Furthermore, I suspect that the gold-plated mirror is not suitable for UV observation.