Probing gas and dust in the tidal tail of NGC 5221 with the type Ia supernova iPTF16abc R. Ferretti, R. Amanullah, A. Goobar, T. Petrushevska, S. Borthakur, M. Bulla, O. Fox, E. Freeland, C. Fremling, L. Hangard and M. Hayes A&A, 606 (2017) A111 Published online: 20 October 2017 DOI: 10.1051/0004-6361/201731409