tokens: We thank Bill Paxton, Josiah Schwab, Pablo Marchant, Rich Townsend, Matteo Cantiello, and Lars Bildsten for engaging conversations about the MESA project. We also thank Michael Wiescher for initial discussions about this paper. This project was supported by NASA under the Theoretical and Computational Astrophysics Networks grant NNX14AB53G and the Astrophysics Theory Program grant 14-ATP14-0007, and by NSF under the Software Infrastructure for Sustained Innovation grant 1339600, and grant PHY 08-022648 for the Physics Frontier Center “Joint Institute for Nuclear Astrophysics—Center for the Evolution of the Elements” (JINA-CEE). C.E.F. acknowledges support from Arizona State University under a 2015 CLAS Undergraduate Summer Enrichment Award, a 2015-2016 Norm Perrill Origins Project Undergraduate Scholarship, and a ASU/NASA Space Grant award. F.X.T. acknowledges sabbatical support from the Simons Foundation.
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