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The recent supernova (SN) known as SN 2009ip had dramatic precursor eruptionsfollowed by an even brighter explosion in 2012. Its pre-2012 observations makeit the best documented SN progenitor in history, but have fueled debate aboutthe nature of its 2012 explosion --- whether it was a true SN or some type ofviolent non-terminal event. Both could power shock interaction withcircumstellar material (CSM), but only a core-collapse SN provides aself-consistent explanation. The persistent broad emission lines in thespectrum require a relatively large ejecta mass, and a corresponding kineticenergy of at least 10^51 erg, while the faint 2012a event is consistent withpublished models of core-collapse SNe from compact (~60 R_Sun) bluesupergiants. The light curves of SN 2009ip and another Type IIn, SN 2010mc,were nearly identical; we demonstrate that their spectra match as well, andthat both are standard SNe IIn. Our observations contradict the recent claimthat the late-time spectrum of SN 2009ip is returning to its progenitor'sLBV-like state, and we show that late-time spectra of SN 2009ip closelyresemble spectra of SN 1987A. Moreover, SN 2009ip's changing H-alpha equivalentwidth after explosion matches behavior typically seen in core-collapse SNe IIn.Several key facts about SN 2009ip and SN 2010mc argue strongly in favor of acore-collapse interpretation, and make a non-terminal 10^50 erg eventimplausible. The most straighforward and self-consistent interpretation is thatSN 2009ip was an initially faint core-collapse explosion of a blue supergiantthat produced about half as much 56-Ni as SN 1987A, with most of the peakluminosity from CSM interaction.

SN 2009ip and SN 2010mc: Core-collapse Type IIn supernovae arising from blue supergiants