Directly imaging massive planets sculpting the inneredges of debris discs with JWST-MIRI

Directly imaged debris discs can be a signpost in the darkness for finding exoplanets; those with sharp inner edges can be evidence for exoplanets, and can be responsible for sculpting these inner edges. All three targets in our JWST Cycle 1 proposal, HD202628, HD21997, and GJ14, have well-resolved ALMA imaging and all show evidence of having sharp inner edges. With the goal of utilising the deep mid-infrared sensitivity of the JWST-MIRI instrument, we used pre-launch performance estimates to customise our observations to be sensitive to sub-Jovian mass companions. In this talk, I will present these MIRI coronagraphic observations at 11.4 microns with emphasis on the new detection parameter space we cover and the sensitives we reach utilising the streamlined python package SpaceKLIP. Although our results have shown no evidence for planets down to ∼ 1MJup in all cases, combined with other factors such as proper motion anomalies - which we are exploring in our JWST Cycle 2 proposal - we can place important constraints on the presence of any bodies that might be responsible for these sharp inner edges.