Explaining the supernova impostor sn 2009ip as mergerburst

Abstract

We propose that the energetic major outburst of the supernova (SN) impostor SN 2009ip in September 2012 (outburst 2012b) was a mergerburst event, where two massive stars merged. The previous outbursts of 2009 and 2011 might have occurred near periastron passages of the binary system prior to the merger, in a similar manner to the luminosity peaks in the nineteenth century Great Eruption of the massive binary system Eta Carinae. The major 2012b outburst and the 2012a pre-outburst, resemble the light curve of the mergerburst event V838 Mon. A merger of an evolved star with a mass of M1~60-100Mo and a secondary main sequence star of M2~0.2-0.5M1 can account for the energy of SN 2009ip and for the high velocities of the ejected gas. The ejected nebula is expected to have a non-spherical structure, e.g. bipolar or even a more complicated morphology.

The Astrophysical Journal Letters, in press

References in corpus (7)

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• A giant outburst two years before the core-collapse of a massive star
• Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
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• The Rise of the Remarkable Type IIn Supernova SN 2009ip
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• Violent Stellar Merger Model for Transient Events

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