A5029192042- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Distributed and Parallel Computing Systems
- Astrophysics and Star Formation Studies
- Geomagnetism and Paleomagnetism Studies
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- Earth Systems and Cosmic Evolution
- Atmospheric Ozone and Climate
- Modeling, Simulation, and Optimization
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Cosmology and Gravitation Theories
- Statistical and numerical algorithms
- Spacecraft Design and Technology
- Inertial Sensor and Navigation
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
University of Cambridge
2015-2025
Institute of Astronomy
2017-2022
Max Planck Society
2018
Leiden University
2007-2016
Leiden Observatory
2007-2012
Kiel University
2005-2009
University of Padua
2003-2007
National Institute for Astrophysics
2007
Gaia is a cornerstone mission in the science programme of EuropeanSpace Agency (ESA). The spacecraft construction was approved 2006, following study which original interferometric concept changed to direct-imaging approach. Both and payload were built by European industry. involvement scientific community focusses on data processing for international Data Processing Analysis Consortium (DPAC) selected 2007. launched 19 December 2013 arrived at its operating point, second Lagrange point...
We present the early installment of third Gaia data release, EDR3, consisting astrometry and photometry for 1.8 billion sources brighter than magnitude 21, complemented with list radial velocities from DR2. EDR3 contains celestial positions apparent brightness in G approximately sources. For 1.5 those sources, parallaxes, proper motions, (G_BP-G_RP) colour are also available. The passbands G, G_BP, G_RP provided as part release. ease use, 7 million DR2 included this after removal a small...
We present the third data release of European Space Agency's Gaia mission, GDR3. The GDR3 catalogue is outcome processing raw collected with instruments during first 34 months mission by Data Processing and Analysis Consortium. contains same source list, celestial positions, proper motions, parallaxes, broad band photometry in G, G$_{BP}$, G$_{RP}$ pass-bands already Early Third Release. introduces an impressive wealth new products. More than 33 million objects ranges $G_{rvs} < 14$ $3100...
At about 1000 days after the launch of Gaia we present first data release, DR1, consisting astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. We summarize DR1 provide illustrations scientific quality data, followed by a discussion limitations due to preliminary nature this release. consists of: primary astrometric set which contains positions, parallaxes, mean proper motions 2 million brightest stars in common with Hipparcos Tycho-2 catalogues secondary...
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, homogeneity of both are unprecedented. Aims. We highlight power DR2 in studying many fine structures Hertzsprung-Russell diagram (HRD). allows us to present different HRDs, depending particular on stellar population selections. do not aim here completeness terms types stars or evolutionary aspects. Instead, we have chosen several...
Aims. We describe the photometric content of second data release Gaia project (Gaia DR2) and its validation along with quality data. Methods. The was mainly carried out using an internal analysis photometry. External comparisons were also made, but limited by precision systematics that may be present in external catalogues used. Results. In addition to assessment, we best estimates three passbands. Various colour-colour transformations are derived enable users convert between commonly used...
Gaia Early Data Release 3 contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the ESA satellite during first 34 months of operations. This paper focuses photometric content, describing input data, algorithms, processing, validation results. Particular attention is given to quality data a number features that users may need take into account make best use EDR3 catalogue. The treatment BP RP background has been updated include better...
The goal of this paper is to demonstrate the outstanding quality second data release Gaia mission and its power for constraining many different aspects dynamics satellites Milky Way. We focus here on determining proper motions 75 Galactic globular clusters, nine dwarf spheroidal galaxies, one ultra-faint system, Large Small Magellanic Clouds. Using extracted from archive, we derived parallaxes these systems, as well their uncertainties. that errors, statistical systematic, are relatively...
We produce a clean and well-characterised catalogue of objects within 100\,pc the Sun from \G\ Early Data Release 3. characterise through comparisons to full data release, external catalogues, simulations. carry out first analysis science that is possible with this sample demonstrate its potential best practices for use. The selection used selected training sets, machine-learning procedures, astrometric quantities, solution quality indicators determine probability reliable. set construction...
We present the early installment of third Gaia data release, EDR3, consisting astrometry and photometry for 1.8 billion sources brighter than magnitude 21, complemented with list radial velocities from DR2. EDR3 contains celestial positions apparent brightness in G approximately sources. For 1.5 those sources, parallaxes, proper motions, (G_BP-G_RP) colour are also available. The passbands G, G_BP, G_RP provided as part release. ease use, 7 million DR2 included this after removal a small...
The Gaia DR3 Catalogue contains for the first time about eight hundred thousand solutions with either orbital elements or trend parameters astrometric, spectroscopic and eclipsing binaries, combinations of them. This paper aims to illustrate huge potential this large non-single star catalogue. Using together models a catalogue tens thousands stellar masses, lower limits, partly consistent flux ratios, has been built. Properties concerning completeness binary catalogues are discussed,...
(Abridged) Blue (BP) and Red (RP) Photometer low-resolution spectral data is one of the exciting new products in Gaia Data Release 3 (Gaia DR3). We calibrate about 65 billion individual transit spectra onto same mean BP/RP instrument through a series calibration steps, including background subtraction, CCD geometry an iterative procedure for efficiency as well variations line-spread function dispersion across focal plane time. The calibrated are then combined each source terms expansion into...
Context. Gaia Data Release 3 contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency (ESA) satellite during first 34 months of its operational phase (the same period covered early 3; EDR3). Low-resolution spectra 220 million are one important new data products included in this release. Aims. In paper, we focus external calibration low-resolution spectroscopic content, describing input data, algorithms, processing,...
With the most recent Gaia data release number of sources with complete 6D phase space information (position and velocity) has increased to well over 33 million stars, while stellar astrophysical parameters are provided for more than 470 sources, in addition identification 11 variable stars. Using variability classifications DR3, we select various populations explore identify non-axisymmetric features disc Milky Way both configuration velocity space. about 580 thousand identified as hot OB...
Gravitational waves from black-hole merging events have revealed a population of extra-galactic BHs residing in short-period binaries with masses that are higher than expected based on most stellar evolution models - and also known stellar-origin black holes our Galaxy. It has been proposed those high-mass the remnants massive metal-poor stars. Gaia astrometry is to uncover many Galactic wide-binary systems containing dormant BHs, which may not detected before. The study this will provide...
We present accurate relative ages for a sample of 55 Galactic globular clusters. The have been obtained by measuring the difference between horizontal branch and turnoff in two, internally photometrically homogeneous databases. mutual consistency two data sets has assessed comparing 16 clusters common also investigated our age determination within recent stellar model framework. All with [Fe/H]-0.8 are ~1 Gyr younger than most metal poor ones, relatively small dispersion, though rich is...
The second Gaia data release is based on 22 months of mission with an average 0.9 billion individual CCD observations per day. A volume this size and granularity requires a robust reliable but still flexible system to achieve the demanding accuracy precision constraints that capable delivering. internal photometric was initialised using iterative process solely data. set calibrations derived for entire DR2 baseline then used produce final mean source photometry. catalogue contains 2.5...
The Gaia Data Release 2 contains the 1st release of radial velocities complementing kinematic data a sample about 7 million relatively bright, late-type stars. Aims: This paper provides detailed description spectroscopic processing pipeline, and approach adopted to derive presented in DR2. Methods: pipeline must perform four main tasks: (i) clean reduce spectra observed with Radial Velocity Spectrometer (RVS); (ii) calibrate RVS instrument, including wavelength, straylight, line-spread...
We compare the Gaia DR2 and EDR3 performances in study of Magellanic Clouds show clear improvements precision accuracy new release. also that systematics still present data make determination 3D geometry LMC a difficult endeavour; this is at very limit usefulness astrometry, but it may become feasible with use additional external data. derive radial tangential velocity maps global profiles for several subsamples we defined. To our knowledge, first time two planar components ordered random...
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, proper motions parallaxes majority of 2.5 million Hipparcos Tycho-2 stars.