Abstract: Hydrogen-rich atmospheres of disk (or nebular) origin could affect our understanding of the origin and evolution of terrestrial planets. It is a natural by-product of planet formation. It is, however, unresolved whether the Earth had such a primordial atmosphere. That hydrogen atmosphere may have brought water, and also affected the orign and evolution of life. Recently, we have faced a new problem as to transiting exoplanets; hydrogen causes degeneracy in inferred compositions of exoplanets with measured masses and radii. In this talk, with our simulations of accumulation of atmospheres of disk origin, I constrain the amout of hydrogen that Earth-like planets should retain.

Additional materials: PDF of slides

ExoClimes 2010, Exeter, Friday 10^th Sep 2010