Investigating the evolution of a double oxygen-neon white dwarf merger remnant

A analysis group led by assistant professor Wu Chengyuan from Yunnan Observatories of the Chinese language Academy of Sciences has investigated the evolution of post-merger remnant ensuing from the coalescence of double oxygen-neon white dwarfs. They’ve discovered that the ultimate destiny of such remnant is impacted by the method of convective boundary mixing. Nonetheless, the wind mass-loss course of and rotation might not have an effect on the evolution and closing destiny of the remnant an excessive amount of.

The research was revealed in Month-to-month Notices of the Royal Astronomical Society.

Double white dwarfs in binary techniques can merger collectively because of the gravitational wave radiation. Double white dwarf binaries are necessary gravitational wave sources in our galaxy, and the huge ones are associated to the sort Ia supernovae, electron seize supernovae and millisecond pulsars.

At current, the evolutionary outcomes of double oxygen-neon white dwarfs mergers are nonetheless unclear. The analysis workforce constructed the corresponding fashions to analyze their evolution. They discovered that such a merger remnant may set off an inwardly propagating O/Ne flame instantly after merger. The remnant would steadily evolve in direction of large phase, and the evolutionary outcomes are linked to the convective boundary mixing course of.

If the blending course of can’t influence the flame, the flame will attain the middle inside 20 years, and the remnant will explode as an iron-core-collapse supernova. If the blending course of can prohibit the flame from reaching the middle, the ultimate consequence of the remnant can be an ONeFe white dwarf by way of electron-capture supernova.

Moreover, researchers discovered that the wind mass-loss course of and rotation might not have an effect on the evolution and closing destiny of the remnant an excessive amount of due to the brief lifetime of the remnant.