Hydrodynamic Escape of Proto-atmosphere Due to Irradiation of the Solar UV

Abstract

There are two important things about the hydrodynamic escape of an atmosphere due to irradiation of the Solar UV. One is the relation between intensity of the Solar UV and stellar age. The other is the efficiency of the conversion of the incoming Solar UV energy to the potential energy of escaping gas. I compile the data of the Extreme Ultraviolet Explorer and investigated the relation between intensities of the solar UV and stellar ages. I develop a numerical code to solve the time-dependent hydrodynamic equations, and compare the numerical results with analytical solutions.