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- W4308204428 abstract "We search for merger products among the 25 most massive white dwarfs in the Montreal White Dwarf Database 100 pc sample through follow-up spectroscopy and high-cadence photometry. We find an unusually high fraction, 40%, of magnetic white dwarfs among this population. In addition, we identify four outliers in transverse velocity and detect rapid rotation in five objects. Our results show that $56^{+9}_{-10}$% of the $Mapprox1.3~M_{odot}$ ultramassive white dwarfs form through mergers. This fraction is significantly higher than expected from the default binary population synthesis calculations using the $alpha$-prescription (with $alpha lambda = 2$), and provides further support for efficient orbital shrinkage, such as with low values of the common envelope efficiency." @default.
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- W4308204428 date "2022-11-04" @default.
- W4308204428 modified "2023-10-14" @default.
- W4308204428 title "The merger fraction of ultramassive white dwarfs" @default.
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- W4308204428 doi "https://doi.org/10.1093/mnras/stac3182" @default.
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