Talk Title: Rocky planet formation with primordial H2-rich atmospheres: Implications for Super-Earths, Sub-Neptunes and Earth

Abstract: Super-Earths and sub-Neptunes are the most abundant exoplanets discovered to date. Recent models of atmospheric evolution and erosion by core-powered mass loss and/or photo-evaporation suggest that these two populations of exoplanets might have been born as one. In my talk, I will explore the question as to how primary, hydrogen-rich atmospheres influence the physical evolution and chemical composition of super-Earths and sub-Neptune exoplanets and as to whether Earth may also have formed from planetary embryos with H2-rich primary atmospheres. Since for most exoplanets, we will only be able to probe atmospheric chemical compositions, understanding their core–mantle–atmosphere connections is likely crucial for correctly inferring the physical properties of their underlaying mantles and cores, which make up the bulk of these planets by mass.

Short Bio: Professor Schlichting’s research interests lie at the intersection of astrophysics and planetary sciences. In her work she combines exoplanet-research with the study of our Solar System and takes advantage of this powerful synergy to develop a comprehensive understanding of planet formation. Her group focuses on pioneering new theoretical models, which are motivated and guided by cutting-edge observations and geochemical measurements, with the goal of explaining the origin and diversity of exoplanets and placing the formation of our own Solar System into context. Professor Schlichting received her undergraduate degrees from the University of Cambridge, her PhD from Caltech and is now a professor of planetary science at UCLA and associate dean for research.