Magnetic star-planet interaction
The principal new situation of planetary orbits within the Alfven radius (were the stellar winds decouple from the star) brings a close magnetic interaction between the innermost extrasolar planets and their stars into play. They remotely resemble closely interacting binaries, but are different due to the largely different sizes and scales of planets and stars. Open questions concern the strength of the planetary and stellar magnetic fields, the formation of magnetospheres and their direct interactions with the stellar winds, coronae, or, possibly, directly with their chromospheres. The solution of these questions will open a new view at possible emissions, e.g. in the radio-range, the expected intensities of which still have to be determined. The radiation models will be developed on the basis of the 3D solar system coupled MHD-plasmaphysical models of the MPS plasma simulation group.