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- W4387209465 abstract "The third data release of Gaia was the first to include orbital solutions assuming non-single stars. Here, we apply the astrometric triage technique of Shahaf et al. 2019 to identify binary star systems with companions that are not single main-sequence stars. Gaia's synthetic photometry of these binaries is used to distinguish between systems likely to have white-dwarf companions and those that may be hierarchical triples. The study uncovered a population of nearly 3200 binaries, characterised by orbital separations on the order of an astronomical unit, in which the faint astrometric companion is probably a white dwarf. Remarkably, over 110 of these systems exhibit significant ultraviolet excess flux, confirming this classification and, in some cases, indicating their relatively young cooling ages. We show that the sample is not easily reproduced by binary population synthesis codes. Therefore, it challenges current binary evolution models, offering a unique opportunity to gain insights into the processes governing white-dwarf formation, binary evolution, and mass transfer." @default.
- W4387209465 created "2023-10-01" @default.
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- W4387209465 date "2023-09-26" @default.
- W4387209465 modified "2023-10-01" @default.
- W4387209465 title "Triage of the Gaia DR3 astrometric orbits. II. A census of white dwarfs" @default.
- W4387209465 doi "https://doi.org/10.48550/arxiv.2309.15143" @default.
- W4387209465 hasPublicationYear "2023" @default.
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