  We show that planet formation via both gravitational collapse and core
accretion is unlikely to occur in equal mass binary systems with moderate (~ 50
AU) semi-major axes. Internal thermal energy generation in the disks is
sufficient to heat the gas everywhere so that spiral structures quickly decay
rather than grow or fragment. This same heating will inhibit dust coagulation
because the temperatures rise above the vaporization temperatures of many
volatile materials. We consider other processes not included in the model and
conclude that our temperatures are conservatively estimated (low), i.e. planet
formation is less likely in real systems than in the model.
