TP6

Understanding surface–exosphere coupling is essential for interpreting observations of airless planets and planning future missions. This session focuses on the physical processes linking surface‑bounded exospheres to their parent surfaces, from atomistic interactions to global dynamics. We welcome contributions from data analysis, laboratory experiments, theoretical work, and numerical modelling that advance our understanding of these systems.

Topics include surface–volatile and plasma interactions, micrometeoroid bombardment, irradiation, space weathering, and volatile implantation. We particularly encourage studies that connect multiple processes or spatial and temporal scales, highlighting the two‑way coupling where surface properties influence exospheric behaviour and exospheric processes contribute to surface evolution.

Comparative studies across planetary bodies, including the Moon, Mercury, asteroids, and icy moons, are also welcome to help refine the physical framework governing surface–exosphere interactions. Contributions linking surface–exosphere processes to exoplanets with tenuous or escaping atmospheres are welcome. This session aims to build a coherent, multi‑scale perspective on the mechanisms shaping these environments and their evolution.

We particularly encourage early‑career scientists to submit abstracts for oral presentations.