OGLE-2013-SN-079: A lonely supernova consistent with a helium shell detonation

Funded by FP7/2007-2013/ERC grant agreement [291222] (S.J.S.). We acknowledge support from STFC grant ST/L000709/1 (S.J.S., S.S.), TRR33 grant of DFG (S.T.), FP7/2007-2013 grant [267251] (N.E.R.), FP7/ERC grant [320360] (M.F.).