tokens: We gratefully acknowledge support from NSF grants AST-1716093 (EMH, AS) and AST-1715145 (AJB) and from the trustees of the William F. Vilas Estate and the University of Wisconsin–Madison Office of the Vice Chancellor for Research and Graduate Education with funding from the Wisconsin Alumni Research Foundation (AJB). The NB921 filter was supported by KAKENHI (23244025) Grant-in-Aid for Scientific Research (A) through the Japan Society for the Promotion of Science (JSPS). The NB816 filter was supported by a grant from Ehime University. We would like to thank Claudia Scarlata for permission to quote unpublished data, David Sobral and Jorryt Matthee for extremely helpful comments on a first draft of the paper, and the anonymous referee for a very useful and constructive report that improved the paper. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
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