tokens: This work was initiated during the International Summer Institute for Modelling in Astrophysics (ISIMA) in 2014, hosted at CITA at the University of Toronto. This work was in part supported by NASA grant NNX13AI27G. We also thank Kristen Menou, Linda Strubbe, Pascale Garaud, Jeremy Leconte, Yanqin Wu, Subu Mohanty, Man-Hoi Lee, Eric Lopez, John Papaloizou, Dan Fabrycky and Arieh Konigl for helpful discussions and correspondence. We also thank the anonymous referee for helpful suggestions. JT is supported by STFC through grant ST/L000636/1. JEO acknowledges support by NASA through Hubble Fellowship grant HST-HF2-51346.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS 5-26555.
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