SN 2010LP - A type IA supernova from a violent merger of two carbon-oxygen white dwarfs

M. Kromer, R. Pakmor, S. Taubenberger, G. Pignata, M. Fink, F.K. Röpke, I.R. Seitenzahl, S.A. Sim, W. Hillebrandt

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34 Citations (Scopus)

Abstract

SN 2010lp is a subluminous Type Ia supernova (SN Ia) with slowly evolving lightcurves. Moreover, it is the only subluminous SN Ia observed so far that shows narrow emission lines of [O I] in late-time spectra, indicating unburned oxygen close to the center of the ejecta. Most explosion models for SNe Ia cannot explain the narrow [O I] emission. Here, we present hydrodynamic explosion and radiative transfer calculations showing that the violent merger of two carbon-oxygen white dwarfs of 0.9 and 0.76 M adequately reproduces the early-time observables of SN 2010lp. Moreover, our model predicts oxygen close to the center of the explosion ejecta, a pre-requisite for narrow [O I] emission in nebular spectra as observed in SN 2010lp.
Original languageEnglish
JournalAstrophysical Journal Letters
Volume778
Issue number1
DOIs
Publication statusPublished - 20 Nov 2013

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