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tokens: M.A. and J.P.W. were supported by NSF and NASA grants AST-1208911 NNX15AC92G, respectively. M.A. also acknowledges support from NSF AST-1518332, NASA NNX15AC89G, NNX15AD95G/NEXSS, and the Center for Integrative Planetary Science at UC Berkeley. Leiden is supported by the European Union A-ERC grant 291141 CHEMPLAN, by the Netherlands Research School for Astronomy (NOVA), and by grant 614.001.352 from the Netherlands Organization for Scientific Research (NWO). A.M. and C.F.M. are supported by ESO Fellowships. M.R.H. is supported by NWO grant 614.001.352. M.T. has been supported by the DISCSIM project, grant agreement 341137 funded by the European Research Council under ERC-2013-ADG. This paper makes use of the following ALMA data: 2015.1.00222.S, 2016.1.01239.S, 2013.1.00226.S, 2013.1.01020.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This work benefited from NASA’s Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA’s Science Mission Directorate.