Two short mass-loss events that unveil the binary heart of Minkowski’s Butterfly Nebula A. Castro-Carrizo, R. Neri, V. Bujarrabal, O. Chesneau, P. Cox and R. Bachiller A&A, 545 (2012) A1 Published online: 27 August 2012 DOI: 10.1051/0004-6361/201118726