Dependence of Type Ia supernova luminosities on their local environment M. Roman, D. Hardin, M. Betoule, P. Astier, C. Balland, R. S. Ellis, S. Fabbro, J. Guy, I. Hook, D. A. Howell et al. (11 more) A&A, 615 (2018) A68 Published online: 16 July 2018 DOI: 10.1051/0004-6361/201731425