Exploring the potential mineralogical diversity in bodies outside the solar system

Determining the diversity of exoplanets’ composition and structure is fundamental for investigating the Earth’s uniqueness. The improvement of ground-based instruments and space missions is and will provide unprecedented information as to exoplanet’s masses, radii and atmospheric speciation. However, none of these properties can uniquely constraint the nature of planetary interiors, which dictate their geological evolution. In order to interpret these new observations and identify future exoplanets targets, the implementation of accurate interior models is required. At present, much of our knowledge on exoplanets’ interior comes from analogue experiments in Earth-like composition performed over pressure-temperature-compositions spaces relevant for the Solar System. Stellar data have indicated a greater compositional diversity than in our Solar System. In this work we will present data from high pressure and temperature experiments conducted between 3 and 7 GPa to explore the potential mineralogical diversity of protoplanets. The bulk major elements composition was obtained from the variability observed in the host star catalogue, and the volatile content was changed in a systematic manner to cover the highest possible diversity. These experiments represent analogues for cores and mantles composition of planets orbiting stars with different compositions than the Sun and provide mineralogical data on potential diversity of exoplanets.