ZTF SN Ia DR2: Secondary maximum in type Ia supernovae M. Deckers, K. Maguire, L. Shingles, G. Dimitriadis, M. Rigault, M. Smith, A. Goobar, J. Nordin, J. Johansson, M. Amenouche et al. (18 more) A&A, 694 (2025) A12 Published online: 14 February 2025 DOI: 10.1051/0004-6361/202450379