Abstract

Despite the discovery of thousands of exoplanets in the innermost regions of planetary systems, planets at 10s of au remain poorly constrained, with their existence often inferred from the presence of planetary material in the form of debris discs. JWST ’s sensitivity, combined with detailed analysis of debris disc morphology, presents an exciting opportunity to study these outer populations and test our understanding of planetary system architecture. In this talk, I will present the results from three JWST programs targeting giant planets in systems with well-resolved debris disc substructures and astrometric accelerations, both evidence of planetary influence. By investigating planet-disc interactions and using observational upper limits, I will demonstrate how stringent constraints can be set on the population of planets in these systems, allowing for the testing of planet formation theories.