SN 2010LP—A TYPE IA SUPERNOVA FROM A VIOLENT MERGER OF TWO CARBON-OXYGEN WHITE DWARFS

SN 2010lp is a subluminous Type Ia supernova (SN Ia) with slowly evolving lightcurves. Moreover, it is the
\nonly subluminous SN Ia observed so far that shows narrow emission lines of [O i] in late-time spectra, indicating
\nunburned oxygen close to the center of the ejecta. Most explosion models for SNe Ia cannot explain the narrow [O i]
\nemission. Here, we present hydrodynamic explosion and radiative transfer calculations showing that the violent
\nmerger of two carbon–oxygen white dwarfs of 0.9 and 0.76 M adequately reproduces the early-time observables
\nof SN 2010lp. Moreover, our model predicts oxygen close to the center of the explosion ejecta, a pre-requisite for
\nnarrow [O i] emission in nebular spectra as observed in SN 2010lp.

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