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tokens: We thank Timothy Brandt for helpful comments and discussion on earlier drafts of this paper. We would also like to thank the anonymous referee for their comments in improving the clarity of the paper. S.G. acknowledges the National Science Foundation Graduate Research Fellowship under grant No. DGE1745303. C.C. acknowledges support from NASA grant AST-1313280, and the Packard Foundation. This paper is based upon work supported by the National Aeronautics and Space Administration (NASA) under Contract No. NNG16PJ26C issued through the WFIRST Science Investigation Teams Program. Some of this material is based upon work supported by the National Science Foundation under Award No. 1501205. We would also like to thank Bill Paxton and the MESA community for making this work possible.