English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The third data release of Gaia was the first to include orbital solutionsassuming non-single stars. Here, we apply the astrometric triage technique ofShahaf et al. 2019 to identify binary star systems with companions that are notsingle main-sequence stars. Gaia's synthetic photometry of these binaries isused to distinguish between systems likely to have white-dwarf companions andthose that may be hierarchical triples. The study uncovered a population ofnearly 3200 binaries, characterised by orbital separations on the order of anastronomical unit, in which the faint astrometric companion is probably a whitedwarf. Remarkably, over 110 of these systems exhibit significant ultravioletexcess flux, confirming this classification and, in some cases, indicatingtheir relatively young cooling ages. We show that the sample is not easilyreproduced by binary population synthesis codes. Therefore, it challengescurrent binary evolution models, offering a unique opportunity to gain insightsinto the processes governing white-dwarf formation, binary evolution, and masstransfer.

Triage of the Gaia DR3 astrometric orbits. II. A census of white dwarfs