  We present initial results of a new campaign of simulations focusing on the
interaction of planetary winds with stellar environments using Adaptive Mesh
Refinement methods. We have confirmed the results of Stone & Proga 2009 that an
azimuthal flow structure is created in the planetary wind due to day/night
temperatures differences. We show that a backflow towards the planet will occur
with a strength that depends on the escape parameter. When a stellar outflow is
included, we see unstable bow waves forming through the outflow's interaction
with the planetary wind.
