Electron-capture supernovae exploding within their progenitor wind Takashi J. Moriya, Nozomu Tominaga, Norbert Langer, Ken’ichi Nomoto, Sergei I. Blinnikov and Elena I. Sorokina A&A, 569 (2014) A57 Published online: 24 September 2014 DOI: 10.1051/0004-6361/201424264