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Superluminous supernovae radiate up to 100 times more energy than normalsupernovae. The origin of this energy and the nature of their stellarprogenitors are poorly understood. We identify neutral iron lines in thespectrum of one such transient, SN 2006gy, and show that they require a largemass of iron (>~0.3 Msun) expanding at 1500 km/s. We demonstrate that a modelof a standard Type Ia supernova hitting a shell of circumstellar materialproduces a light curve and late-time iron-dominated spectrum that match SN2006gy. In such a scenario, common envelope evolution of the progenitor systemcan synchronize envelope ejection and supernova explosion and may explain thesebright transients.

A Type Ia supernova at the heart of superluminous transient SN 2006gy