EXOA9

This session invited papers that explore the evolution of rocky exoplanets from the perspective of changes to the composition of the Galaxy with time. For example, the inventories of the principal long-lived heat-producing elements (HPEs) 40-K, 235,238-U and 232-Th are encoded in stellar metallicity, age, and nucleosynthetic history. Yet, the long-term thermal evolution of rocky exoplanets driven by different HPE inventories is often overlooked even though this evolution is critical factor in interpreting physical properties including retrieved data for secondary and hybrid atmospheres. We invite papers that report current understanding of how galactic chemical evolution (GCE) processes affect the abundances of the rock-forming elements (Mg, Si, O, Al, Fe, Ca, Na, K), on controls for the abundances of HPEs, of plausible radiogenic heat budgets of rocky exoplanets across different stellar populations in the Milky Way, as well as the expression of these different evolutionary tracks as a function of parameters such as system age.

The session encompasses work related to observational, theoretical and experimental studies of rocky exoplanets connecting GCE and nucleosynthesis with exoplanetary geodynamics, as well as how these affect magnetic dynamo generation, volcanic activity, and secondary/hybrid atmosphere generation.