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Almost all of the elements heavier than hydrogen that are present in oursolar system were produced by nuclear burning processes either in the earlyuniverse or at some point in the life cycle of stars. In all of theseenvironments, there are dozens to thousands of nuclear species that interactwith each other to produce successively heavier elements. In this paper, wepresent SkyNet, a new general-purpose nuclear reaction network that evolves theabundances of nuclear species under the influence of nuclear reactions. SkyNetcan be used to compute the nucleosynthesis evolution in all astrophysicalscenarios where nucleosynthesis occurs. SkyNet is free and open-source and aimsto be easy to use and flexible. Any list of isotopes can be evolved and SkyNetsupports various different types of nuclear reactions. SkyNet is modular sothat new or existing physics, like nuclear reactions or equations of state, caneasily be added or modified. Here, we present in detail the physics implementedin SkyNet with a focus on a self-consistent transition to and from nuclearstatistical equilibrium (NSE) to non-equilibrium nuclear burning, ourimplementation of electron screening, and coupling of the network to anequation of state. We also present comprehensive code tests and comparisonswith existing nuclear reaction networks. We find that SkyNet agrees withpublished results and other codes to an accuracy of a few percent.Discrepancies, where they exist, can be traced to differences in the physicsimplementations.

SkyNet: A modular nuclear reaction network library