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Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure
GEPI, Observatoire de Paris, Université PSL, CNRS, 5 place Jules Janssen, 92190 Meudon, France.ORCID iD: 0000-0003-2837-3899
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France; GEPI, Observatoire de Paris, Université PSL, CNRS, 5 place Jules Janssen, 92190 Meudon, France.
School of Physics and Astronomy/Space Park Leicester, University of Leicester, University Road, Leicester LE1 7RH, UK.
School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6997801, Israel.
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Number of Authors: 4502023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 674, article id A34Article in journal (Refereed) Published
Abstract [en]

Context. The Gaia DR3 catalogue contains, for the first time, about 800 000 solutions with either orbital elements or trend parameters for astrometric, spectroscopic, and eclipsing binaries, and combinations of these three.

Aims. With this paper, we aim to illustrate the huge potential of this large non-single-star catalogue.

Methods. Using the orbital solutions and models of the binaries, we have built a catalogue of tens of thousands of stellar masses or lower limits thereof, some with consistent flux ratios. Properties concerning the completeness of the binary catalogues are discussed, statistical features of the orbital elements are explained, and a comparison with other catalogues is performed.

Results. Illustrative applications are proposed for binaries across the Hertzsprung-Russell Diagram (HRD). Binarity is studied in the giant branch and a search for genuine spectroscopic binaries among long-period variables is performed. The discovery of new EL CVn systems illustrates the potential of combining variability and binarity catalogues. Potential compact object companions are presented, mainly white dwarf companions or double degenerates, but one candidate neutron star is also found. Towards the bottom of the main sequence, the orbits of previously suspected binary ultracool dwarfs are determined and new candidate binaries are discovered. The long awaited contribution of Gaia to the analysis of the substellar regime shows the brown dwarf desert around solar-type stars using true rather than minimum masses, and provides new important constraints on the occurrence rates of substellar companions to M dwarfs. Several dozen new exoplanets are proposed, including two with validated orbital solutions and one super-Jupiter orbiting a white dwarf, all being candidates requiring confirmation. Besides binarity, higher order multiple systems are also found.

Conclusions. By increasing the number of known binary orbits by more than one order of magnitude, Gaia DR3 will provide a rich reservoir of dynamical masses and an important contribution to the analysis of stellar multiplicity.

Place, publisher, year, edition, pages
EDP Sciences, 2023. Vol. 674, article id A34
Keywords [en]
binaries: general, astrometry, planetary systems, stars: fundamental parameters, catalogs, white dwarfs
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-101534DOI: 10.1051/0004-6361/202243782ISI: 001023554300001Scopus ID: 2-s2.0-85163603964OAI: oai:DiVA.org:ltu-101534DiVA, id: diva2:1801758
Note

Validerad;2023;Nivå 2;2023-12-11 (hanlid);

For funding information see: https://doi.org/10.1051/0004-6361/202243782;

Full text license: CC BY

Available from: 2023-10-02 Created: 2023-10-02 Last updated: 2023-12-13Bibliographically approved

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Granvik, Mikael

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