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tokens: The authors thank Javier Coronado-Blázquez, Jose Luis Contreras, and the anonymous referee for helpful comments. A.D. is thankful for the support of the Ramón y Cajal program from the Spanish MINECO. R.W. was supported by a grant from VILLUM FONDEN (Project No. 16599). J.F. is supported by NASA under contract S-15633Y. M.A. and A.D. acknowledge funding support from NSF through grant AST-1715256. K.H. acknowledges support from the Icelandic Research Fund, grant No. 173728-051. D.H. and L.M. acknowledge funding support from NASA through grant 80NSSC18K1720.