tokens: Acknowledgements JDS acknowledges the support from the European Research Council (ERC) under the Horizon 2020 Framework Program via the Consolidator Grant CSF-648505. AB acknowledges the support from the ERC Advanced Grant ORISTARS under the European Union’s Seventh Framework Programme (Grant 291294). AP was partly funded by a Canadian Institute for Theoretical Astrophysics (CITA) National Fellowship. We thank the referee M. Alves for her constructive comments that have led to improvements in this presentation of our results. Thanks to M. Houde and S. Basu for their comments on the early versions of this work. We also thank the following people who helped with their encouragement and conversation: P. G. Martin, H. Beuther, C. Heiles, T. Robishaw, M.-A. Miville-Deschênes, and A. Roy. Special thanks go to Thomas Müller at the Haus der Astronomie for his assistance in the magnetic field visualization.
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