Investigating the Evolution of Post-Merger Remnant
A research team led by Assistant Professor Wu Chengyuan from Yunnan Observatories of the Chinese Academy of Sciences has delved into the evolution of post-merger remnants resulting from the coalescence of double oxygen-neon white dwarfs. Their findings shed light on how specific factors influence the final fate of such remnants.
Impacts of Convective Boundary Mixing
The researchers explored the influence of the convective boundary mixing process on the ultimate destiny of these remnants. They also examined whether the wind mass-loss process and rotation play significant roles in shaping the evolution and outcome of the remnants.
Double white dwarfs within binary systems can potentially merge due to gravitational wave radiation. These binary systems are essential sources of gravitational waves in our galaxy.
Additionally, massive double white dwarf binaries are associated with type Ia supernovae, electron capture supernovae, and millisecond pulsars.
Uncertainty Surrounding Merger Outcomes
The research community lacks clarity regarding the evolutionary outcomes of mergers involving double oxygen-neon white dwarfs. To address this uncertainty, the research team developed models to investigate the evolution of such merger remnants.
The study revealed that when two oxygen-neon white dwarfs merge, they can trigger an inwardly propagating O/Ne flame shortly after the merger event. Subsequently, the remnant’s evolution towards the giant phase is determined by the convective boundary mixing process.
Two Possible Outcomes
The research team identified two possible outcomes based on the role of the mixing process. If the mixing process fails to impact the flame, it will reach the center within approximately 20 years, leading to the remnant exploding as an iron-core-collapse supernova.
Conversely, if the mixing process prevents the flame from reaching the center, the remnant’s final state will be an ONeFe white dwarf, achieved through an electron-capture supernova.
Interestingly, the study indicated that the wind mass-loss process and rotation may not significantly alter the evolution and ultimate fate of the remnant. This is attributed to the relatively short lifetime of the rest.
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