Abstract DGP2026-120

As observation push the frontier of terrestrial exoplanet discovery, a better understanding of the evolution of terrestrial planet interiors and their redox transformations is required. We are developing a comprehensive one-dimensional (1D) mineralogical and geochemical interior model. This model is designed to simulate the initial conditions and subsequent evolution of rocky planet interiors. Our goal is to investigate the physical and thermal evolution of planetary interiors and the behavior of core formation during planetary accretion.

 

This project develops a 1D grid-based compressible interior structure model that includes a magma ocean thermal evolution and solidification. Building upon existing codes and models (Noack et al.,2016), we extend previous approaches by incorporating depth-dependent thermodynamic properties and implementing high-temperature and high-pressure melt equations of state (EOS). We also considered the accretion rates of planets under both pebble and planetesimal accretion. Furthermore, we introduce a composition-dependent melting temperature based on the FeO-MgO-SiO2 system (Boukaré et al., 2015).

 

Our approach is expected to provide thermal and physical profiles from the onset of planet formation to the end of the magma ocean stage. It also provides constraints on the characteristics of the iron core as a function of the planet’s formation composition. Moreover, the model includes interfaces for coupling with planetary atmospheric models, enabling comprehensive simulations that couple interior evolution with surface and atmosphere under evolving redox states.