EXOA13

The coming years will be revolutionary for rocky planet research, with JWST, ELT, ARIEL, and PLATO providing unprecedented observations of rocky exoplanets in our galaxy. At the same time, BepiColombo, the Mars sample return mission, and the Decade of Venus missions will greatly enhance our understanding of the rocky bodies within the Solar System. These missions will offer valuable new observations of the atmospheres and surfaces of these rocky bodies, while Solar System missions will also probe magnetic fields. Interpreting these observations, and leveraging them to constrain the body’s interior properties, requires a deeper understanding of how a planet’s surface, atmosphere, and interior interact.

Rocky planet atmospheres and surfaces form and evolve under close interaction with their deeper interiors. Whether a planet has formed an atmosphere by volatile exchange with a magma ocean, by volcanic outgassing, or lost its atmosphere completely, understanding its observed state requires knowledge of interconnected processes operating across a wide range of spatial and temporal scales. Processes governing atmospheric evolution, and how it interacts with the interior, include volcanism, weathering, tectonics, magnetic field generation, interior and atmospheric volatile chemistry, and atmospheric loss. These processes operate on various timescales, from rapid magma-atmosphere equilibration, to the shaping of tectonics on the early Earth, to long-term climate feedbacks that sustain temperate conditions on planets like Earth. Studying these interactions - both in the Solar System and beyond - demands a fundamentally multidisciplinary understanding of rocky planets, spanning astronomy, geosciences, and planetary sciences.

This session aims to bring together scientists from astronomy, geosciences, and planetary sciences, to explore how interior-atmosphere interaction shapes rocky (exo)planet surfaces and atmospheres. We welcome contributions spanning experimental work, observational efforts, and modelling studies. By combining insights from exoplanets, which serve as a natural laboratory for rocky world diversity, and Solar System planets, which provide the detailed observations needed to build and validate models, we can develop a robust framework for interpreting observations of any rocky body. We encourage discussions that span all related fields, fostering new collaborative approaches to studying rocky planet evolution.