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Journal Article

Gaia Data Release 2. First stellar parameters from Apsis

MPS-Authors

Andrae,  René
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fouesneau,  Morgan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Creevey,  Orlagh
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ordenovic,  Christophe
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mary,  Nicolas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Burlacu,  Alexandru
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chaoul,  Laurence
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jean-Antoine-Piccolo,  Anne
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kordopatis,  Georges
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Korn,  Andreas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lebreton,  Yveline
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Panem,  Chantal
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pichon,  Bernard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Thévenin,  Frédéric
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Walmsley,  Gavin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bailer-Jones,  Coryn A. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018A&A...616A...8A
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Citation

Andrae, R., Fouesneau, M., Creevey, O., Ordenovic, C., Mary, N., Burlacu, A., et al. (2018). Gaia Data Release 2. First stellar parameters from Apsis. Astronomy and Astrophysics, 616.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CF3C-0
Abstract
The second Gaia data release (Gaia DR2) contains, beyond the astrometry, three-band photometry for 1.38 billion sources. One band is the G band, the other two were obtained by integrating the Gaia prism spectra (BP and RP). We have used these three broad photometric bands to infer stellar effective temperatures, Teff, for all sources brighter than G = 17 mag with Teff in the range 3000-10 000 K (some 161 million sources). Using in addition the parallaxes, we infer the line-of-sight extinction, AG, and the reddening, E(BP - RP), for 88 million sources. Together with a bolometric correction we derive luminosity and radius for 77 million sources. These quantities as well as their estimated uncertainties are part of Gaia DR2. Here we describe the procedures by which these quantities were obtained, including the underlying assumptions, comparison with literature estimates, and the limitations of our results. Typical accuracies are of order 324 K (Teff), 0.46 mag (AG), 0.23 mag (E(BP - RP)), 15% (luminosity), and 10% (radius). Being based on only a small number of observable quantities and limited training data, our results are necessarily subject to some extreme assumptions that can lead to strong systematics in some cases (not included in the aforementioned accuracy estimates). One aspect is the non-negativity contraint of our estimates, in particular extinction, which we discuss. Yet in several regions of parameter space our results show very good performance, for example for red clump stars and solar analogues. Large uncertainties render the extinctions less useful at the individual star level, but they show good performance for ensemble estimates. We identify regimes in which our parameters should and should not be used and we define a "clean" sample. Despite the limitations, this is the largest catalogue of uniformly-inferred stellar parameters to date. More precise and detailed astrophysical parameters based on the full BP/RP spectrophotometry are planned as part of the third Gaia data release.