The multifaceted connection between the atmospheric composition of giant planets and their native disc

Abstract: Planet formation shapes the composition of giant planets and is expected to leave chemical fingerprints in their atmospheres. We have traced these fingerprints in the atmospheric abundances of carbon, oxygen, nitrogen, and sulphur. I will discuss how the abundance ratios of these elements in planetary atmospheres are influenced by the physical and chemical evolution of the natal protoplanetary disc and the process of planet formation and migration. Disc evolution strongly influences the distribution of carbon and oxygen between gas and solids in the disc, challenging the interpretation of the planetary C/O ratio. The joint comparison of multiple elemental ratios, including the refractory-to-volatile ratio, with the host star's composition constraints various aspects of planet formation, including the accretion of planetesimals, gas, and/or volatile-enriched gas due to the sublimation of drifting icy grains. I will also present the first applications of our interpretative framework to spectroscopic observations of hot and warm Jupiters.