Search Publications
Gaia Data Release 2. Summary of the contents and survey properties
Prusti, T.; Mazeh, T.; Zucker, S. +451 more
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided for a modest sample of minor planets in the solar system.
Aims: A sum…
Gaia Data Release 2. The astrometric solution
Mora, A.; Esquej, P.; Jordan, S. +87 more
Context. Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the first 22 months of its operational phase.
Aims: We describe the input data, models, and processing used for the astrometric content of Gaia DR2,…
Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
Blinnikov, Sergei; Townsend, Richard H. D.; Bildsten, Lars +10 more
We update the capabilities of the software instrument Modules for Experiments in Stellar Astrophysics (MESA) and enhance its ease of use and availability. Our new approach to locating convective boundaries is consistent with the physics of convection, and yields reliable values of the convective-core mass during both hydrogen- and helium-burning p…
Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2
Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M. +2 more
For the vast majority of stars in the second Gaia data release, reliable distances cannot be obtained by inverting the parallax. A correct inference procedure must instead be used to account for the nonlinearity of the transformation and the asymmetry of the resulting probability distribution. Here, we infer distances to essentially all 1.33 billi…
The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
Brown, Anthony G. A.; Helmi, Amina; Babusiaux, Carine +3 more
The assembly of our Galaxy can be reconstructed using the motions and chemistry of individual stars1,2. Chemo-dynamical studies of the stellar halo near the Sun have indicated the presence of multiple components3, such as streams4 and clumps5, as well as correlations between the stars' chemical abundance…
The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview
Hughes, A. Meredith; Wilner, David J.; Andrews, Sean M. +14 more
We introduce the Disk Substructures at High Angular Resolution Project (DSHARP), one of the initial Large Programs conducted with the Atacama Large Millimeter/submillimeter Array (ALMA). The primary goal of DSHARP is to find and characterize substructures in the spatial distributions of solid particles for a sample of 20 nearby protoplanetary disk…
ATLAS: A High-cadence All-sky Survey System
Rest, A.; Smartt, S. J.; Stalder, B. +6 more
Technology has advanced to the point that it is possible to image the entire sky every night and process the data in real time. The sky is hardly static: many interesting phenomena occur, including variable stationary objects such as stars or QSOs, transient stationary objects such as supernovae or M dwarf flares, and moving objects such as astero…
Co-formation of the disc and the stellar halo
Evans, N. W.; Belokurov, V.; Koposov, S. E. +2 more
Using a large sample of main sequence stars with 7D measurements supplied by Gaia and SDSS, we study the kinematic properties of the local (within ∼10 kpc from the Sun) stellar halo. We demonstrate that the halo's velocity ellipsoid evolves strongly with metallicity. At the low-[Fe/H] end, the orbital anisotropy (the amount of motion in the radial…
Gaia Data Release 2. Observational Hertzsprung-Russell diagrams
Prusti, T.; Mazeh, T.; Zucker, S. +450 more
Context. Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky. The precision, accuracy, and homogeneity of both astrometry and photometry are unprecedented.
Aims: We highlight the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagra…
Gaia Data Release 2. Photometric content and validation
Gilmore, G.; Harrison, D. L.; Koposov, S. E. +43 more
Aims: We describe the photometric content of the second data release of the Gaia project (Gaia DR2) and its validation along with the quality of the data.
Methods: The validation was mainly carried out using an internal analysis of the photometry. External comparisons were also made, but were limited by the precision and systematics that…