Characterising the interiors of planets orbiting compositionally-diverse stars across the Galaxy

Exoplanets are built from protoplanetary disk ingredients that are thought to be preserved during formation. In small, terrestrial worlds, refractory elements sink to dominate planetary cores and mantles with volatile components potentially producing ocean and atmospheric layers. Thus, natal disk abundance ratios are predicted to influence planetary internal structures. Additionally, varying disk chemistry could alter formation mechanisms via different disk dust-to-gas ratios and surface-densities at crucial radial distances, and overall pebble accretion rates. Post formation, disk composition plays a key role in planet migration due to differing disk drift rates, and planet evolution via varying atmospheric mass-loss properties as a function of metallicity. Tentative evidence of a star-planet composition link exists. If true, this would imply that planets orbiting stars of varying chemistry, in the Milky Way's thick disk, should form and evolve planets differently, also impacting habitability. In this talk, I will review the current state of the field…