tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for their constructive review, which helped improve the paper. We thank Rachel Mason for making the XDGNIRS reduction pipeline available. CMB acknowledges support from the Australian Government Research Training Program Scholarship. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). RMcD is the recipient of an Australian Research Council Future Fellowship (project number FT150100333). CC acknowledges support from NASA grant NNX15AK14G, NSF grant AST-1313280 and the Packard Foundation.
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