tokens: Y.F. is supported from the Grant-in-Aid No. 25887024 by the Japan Society for the Promotion of Science and from an appointment to the NASA Postdoctoral Program at NASA Goddard Institute for Space Studies, administered by Oak Ridge Affiliated Universities. D.S.S. gratefully acknowledges support from a fellowship from the AMIAS group. J.N. acknowledges support from NASA grant HST AR-12146.04-A and NSF grant AST-1102738. We thank David Hogg for encouraging us to pursue calculations of exoplanetary radio emission. We thank Greg Novak for helpful conversations. We thank Jake VanderPlas for developing the XKCD-style plotting package for matplotlib, and acknowledge its use. A.P. is grateful for support from NSF grants 1352519 and 1440343. Y.F. greatly acknowledges insightful and helpful discussions with Tomoki Kimura and Hiroki Harakawa. The portion of this research for which T.M. is responsible was performed under a National Research Council Research Associateship Award at the Naval Research Laboratory (NRL). Basic research in radio astronomy at NRL is supported by 6.1 Base funding.
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