Output forces from disc to star
Speaking with @elena and @crida, it became clear that I might need to consider the total force that the star feels from the disc which also has an effect on the planet (when
IndirectForces is set to true). They found that these indirect forces on the planet should actually be considered.
One could obtain these forces after the simulation has run, from the gas distribution, but this requires outputting the disc structure too often to obtain good temporal resolution of these forces.
Instead, I propose to create another tracker which mimics the already present tracker
Hill_force_txt_logger, but which outputs the forces that the star feels. I don't know that such a tracker already exists.