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We propose that the major 2012 outburst of the supernova impostor SN 2009ipwas powered by an extended and repeated interaction between the Luminous BlueVariable (LBV) and a more compact companion. Motivated by the recent analysisof Margutti et al. (2013) of ejected clumps and shells we consider twoscenarios. In both scenarios the major 2012b outburst with total (radiated +kinetic) energy of ~5 x 10^{49} erg was powered by accretion of 2-5 solarmasses onto the companion during a periastron passage (the first passage) ofthe binary system approximately 20 days before the observed maximum of thelight curve. In the first scenario, the surviving companion scenario, thecompanion was not destructed and still exists in the system after the outburst.It ejected partial shells (or collimated outflows or clumps) for twoconsecutive periastron passages after the major one. The orbital period wasreduced from ~38 days to ~25 days as a result of the mass transfer process thattook place during the first periastron passage. In the second scenario, themerger scenario, some partial shells/clumps were ejected also in a secondperiastron passage that took place ~20 days after the first one. After thissecond periastron passage the companion dived too deep into the LBV envelope tolaunch more outflows, and merged with the LBV.

Powering the Second 2012 Outburst of SN 2009ip by Repeating Binary Interaction