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Gaia Data Release 3: A golden sample of astrophysical parameters
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
UNED, Dept Inteligencia Artificial, C Juan del Rosal 16, Madrid 28040, Spain.
Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy; Space Sci Data Ctr ASI, Via Politecn SNC, I-00133 Rome, Italy.
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2023 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 674, article id A39Article in journal (Refereed) Published
Abstract [en]

Context. Gaia Data Release 3 (DR3) provides a wealth of new data products for the astronomical community to exploit, including astrophysical parameters for half a billion stars. In this work, we demonstrate the high quality of these data products and illustrate their use in different astrophysical contexts.

Aims. We produce homogeneous samples of stars with high-quality astrophysical parameters by exploiting Gaia DR3, while focusing on many regimes across the Hertzsprung-Russell (HR) diagram; spectral types OBA, FGKM, and ultracool dwarfs (UCDs). We also focus on specific subsamples of particular interest to the community: solar analogues, carbon stars, and the Gaia spectrophotometric standard stars (SPSS).

Methods. We query the astrophysical parameter tables along with other tables in Gaia DR3 to derive the samples of the stars of interest. We validate our results using the Gaia catalogue itself and by comparison with external data.

Results. We produced six homogeneous samples of stars with high-quality astrophysical parameters across the HR diagram for the community to exploit. We first focus on three samples that span a large parameter space: young massive disc stars (OBA; about 3 Million), FGKM spectral type stars (about 3 Million), and UCDs (about 20 000). We provide these sources along with additional information (either a flag or complementary parameters) as tables that are made available in the Gaia archive. We also identify 15 740 bone fide carbon stars and 5863 solar analogues, and provide the first homogeneous set of stellar parameters of the SPSS sample. We demonstrate some applications of these samples in different astrophysical contexts. We use a subset of the OBA sample to illustrate its usefulness in analysing the Milky Way rotation curve. We then use the properties of the FGKM stars to analyse known exoplanet systems. We also analyse the ages of some unseen UCD-companions to the FGKM stars. We additionally predict the colours of the Sun in various passbands (Gaia, 2MASS, WISE) using the solar-analogue sample.

Conclusions. Gaia DR3 contains a wealth of new high-quality astrophysical parameters for the community to exploit.

Place, publisher, year, edition, pages
EDP Sciences , 2023. Vol. 674, article id A39
Keywords [en]
catalogs, stars: fundamental parameters, stars: early-type, stars: low-mass, Galaxy: stellar content, Galaxy: kinematics and dynamics
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-101674DOI: 10.1051/0004-6361/202243800ISI: 001024440700038Scopus ID: 2-s2.0-85164201977OAI: oai:DiVA.org:ltu-101674DiVA, id: diva2:1805202
Note

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

CC BY 4.0 License

Available from: 2023-10-16 Created: 2023-10-16 Last updated: 2023-12-11Bibliographically approved

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Granvik, Mikael

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