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We report a radio detection of supernova SN 2004ip in the circumnuclearregion of the luminous infrared galaxy IRAS 18293-3413, using Very Large Array(VLA) observations at 8.4 GHz on 11 June 2007. SN 2004ip had been previouslydiscovered at near-infrared wavelengths using adaptive optics observations, butits nature (core-collapse or thermonuclear) could not be definitelyestablished. Our radio detection, about three years after the explosion of thesupernova, indicates a prominent interaction of the ejecta of SN 2004ip withthe circumstellar medium, confirming that the supernova was a core-collapseevent (probably Type II), and thus strongly suggesting that its progenitor wasa massive star with a significant mass-loss prior to its explosion. SN 2004iphas a 8.4 GHz luminosity of 3.5E27 erg/s/Hz, about twice as bright as SN 2000ftin NGC 7469 at a similar age, and given its projected distance to the nucleus(~500 pc), is one of the closest of all known radio SNe to a galaxy nucleus,and one of the brightest radio SNe ever.

Radio Detection of Supernova 2004ip in the Circumnuclear Region of the Luminous Infrared Galaxy IRAS 18293-3413