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Stellar evolution models predict the existence of hybrid white dwarfs (WDs)with a carbon-oxygen core surrounded by an oxygen-neon mantle. Being born withmasses ~1.1 Msun, hybrid WDs in a binary system may easily approach theChandrasekhar mass (MCh) by accretion and give rise to a thermonuclearexplosion. Here, we investigate an off-centre deflagration in a near-MCh hybridWD under the assumption that nuclear burning only occurs in carbon-richmaterial. Performing hydrodynamics simulations of the explosion and detailednucleosynthesis post-processing calculations, we find that only 0.014 Msun ofmaterial is ejected while the remainder of the mass stays bound. The ejectaconsist predominantly of iron-group elements, O, C, Si and S. We also calculatesynthetic observables for our model and find reasonable agreement with thefaint Type Iax SN 2008ha. This shows for the first time that deflagrations innear-MCh WDs can in principle explain the observed diversity of Type Iaxsupernovae. Leaving behind a near-MCh bound remnant opens the possibility forrecurrent explosions or a subsequent accretion-induced collapse in faint TypeIax SNe, if further accretion episodes occur. From binary population synthesiscalculations, we find the rate of hybrid WDs approaching MCh to be on the orderof 1 percent of the Galactic SN Ia rate.

Deflagrations in hybrid CONe white dwarfs: a route to explain the faint Type Iax supernova 2008ha