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tokens: Acknowledgements We would like to thank Andrew Cunningham, Patrick Hennebelle, Shu-Ichiro Inutsuka, Ralf Klessen, Pak Shing Li, Zhi-Yun Li, and Andrew Myers for helpful discussions. We particularly thank Kengo Tomida for pointing out that the angular momentum lost in the growth of sink particles could significantly affect disc formation in numerical simulations and for providing valuable references. Helpful comments by the referee are gratefully acknowledged. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 (WJG and RIK). Support for this work was provided by NASA through Astrophysics Theory Program (ATP) grant NNX-13AB84G (RIK and CFM) and Theoretical and Computational Astrophysics Network (TCAN) grant NNX-14AB52G (CFM and RIK) and the NSF through grant AST-1211729 (CFM and RIK). Supercomputing support was provided by NASA, through a grant from the ATP, from Lawrence Livermore National Laboratory, and from NERSC. The figures and analysis presented here were created using the yt analysis package (Turk et al. 2011 ).