Exploring the effects of terrestrial exoplanet bulk composition on long-term planetary evolution

• DOI: 10.5194/egusphere-egu23-7777
• Publication Date: 2023-02-25T21:46:27Z
• Authors: Rob Spaargaren; Maxim Ballmer; Stephen Mojzsis; Paul Tackley
• Keywords: Planetary differentiation

New terrestrial exoplanets are being discovered at an ever faster pace, and each discovery leads to a widening of our understanding planetary diversity. A key aspect in the quest better quantify planet diversity is gain information on plausible bulk compositions, as this physical-chemical quantity determines planet's structure, which turn controls physical properties its layers (core, mantle, crust, atmosphere). Recent insights expected range compositions allow us investigate how fundamental parameter affects evolution interior surface, consequently guide next-generation ground- space-based telescopic observations exoplanet properties, such atmospheric composition.Here, we first simulate mantle mineralogies for with various using Gibbs energy minimization algorithm, Perple_X. Using mineralogy resulting employ 2D global-scale model thermochemical convection variations between Earth-sized different terms evolution. We include effects composition melting. thermal evolution, whether it has effect propensity towards plate tectonics-like behaviour.In general, Earth tends have average most elements, except iron, relatively rich in, therefore above core size. Our preliminary results show that size (and thus iron abundance) convective vigor, interior. further find major differences planets ratios Mg-silicates, these minerals control viscosity, thereby Planets lower Mg/Si than will significantly stronger impeding cooling lifetimes, while much higher weaker upper mantles, impacting surface mobility. Stellar good indicator relative abundances minerals, can be important source information. Therefore, host stellar seem rocky used target selection future missions.