Observational evidence of deficit of planets at radius ~2 R_earth
Camilla Agentoft (Stellar Astrophysics Centre, Aarhus University), Mia Sloth Lundkvist (LSW, University of Heidelberg, Stellar Astrophysics Centre), Hans Kjeldsen (Stellar Astrophysics Centre, Aarhus University)

We present an extended study of 139 exoplanets, whose host stars were studied extensively through asteroseismology by Lundkvist et al. 2016. The combination of high precision stellar parameters from asteroseismology combined with high quality transit-fits produce the best characterized exoplanet-systems. Our analysis revealed a deficiency gap in the number of exoplanets with a radius ~2 R_earth, which is caused by the evaporation of the atmosphere of the exoplanets. The distinction between pure rocky planets, and planets with an envelope of water or gas was also clearly visible from density determinations.