At present, the evolutionary outcomes of double oxygen-neon white dwarfs mergers are still unclear. The research team constructed the corresponding models to investigate their. They found that such a merger remnant could trigger an inwardly propagating O/Ne flame immediately after merger. The remnant would gradually evolve towards giant phase, and the evolutionary outcomes are linked to the convective boundary mixing process.
If the mixing process cannot impact the flame, the flame will reach the center within 20 years, and the remnant will explode as an iron-core-collapse supernova. If the mixing process can prohibit the flame from reaching the center, the final outcome of the remnant would be an ONeFe white dwarf through electron-capture supernova.
Furthermore, researchers found that the wind mass-loss process and rotation may not affect the evolution and final fate of the remnant too much because of the short lifetime of the remnant.Monthly Notices of the Royal Astronomical Society