Physical properties of AM CVn stars: New insights from Gaia DR2 G. Ramsay, M. J. Green, T. R. Marsh, T. Kupfer, E. Breedt, V. Korol, P. J. Groot, C. Knigge, G. Nelemans, D. Steeghs et al. (2 more) A&A, 620 (2018) A141 Published online: 11 December 2018 DOI: 10.1051/0004-6361/201834261