Double white dwarf (WD) binaries are vital gravitational wave sources in our galaxy, and their mass is expounded to the sort Ia supernovae, electron seize supernovae and millisecond pulsars.
Double WDs in binary methods can merge collectively because of the gravitational wave radiation. Nonetheless, the evolution of postmerger remnants from such a merger stays unclear.
Now, a analysis group led by assistant professor Wu Chengyuan from the Yunnan Observatories of the Chinese language Academy of Sciences investigated the the evolutionary outcomes from the merger of oxygen-neon WD and carbon-oxygen WD.
The examine was printed within the Astrophysical Journal Letters on Feb. 22.
The researchers constructed corresponding fashions to analyze the evolution of merger remnants. They discovered that such merger remnants can evolve to carbon-oxygen giants, and their evolutionary outcomes are associated to their total lots.
Below the fastened wind mass-loss prescription, remnants with lots lighter than 1.90M⊙ might evolve to oxygen-neon WDs, whereas the remnants with lots higher than 1.95M⊙ might expertise electron seize supernova explosions to grow to be oxygen-neon-iron WDs.
“Our end result implies that the super-Chandrasekhar mass remnants originated from the mergers of oxygen-neon WD and carbon-oxygen WD can’t kind neutron stars, which challenged the normal understandings,” stated Wu.
Furthermore, they used the corresponding fashions to clarify the oxygen-rich object IRAS 00500+6713 (J005311) situated within the infrared nebula in Cassiopeia. The spectrum of this object is just like that of the oxygen-rich Wolf-Rayet stars, and it has comparatively excessive wind mass-loss charge and very excessive wind velocity.
At current, the origin of this object continues to be unclear. Wu defined the observational options of this object by utilizing their fashions, and located that this object was originated from the merger of a 1.08M⊙ oxygen-neon WD with a 0.52M⊙ carbon-oxygen WD.
Extra data:
Chengyuan Wu et al, Evolution of the Postmerger Remnants from the Coalescence of Oxygen–Neon and Carbon–Oxygen White Dwarf Pairs, The Astrophysical Journal Letters (2023). DOI: 10.3847/2041-8213/acb6f3
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What occurs after a merger of huge double white dwarfs? (2023, March 9)
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