A5045680170- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Mechanics and Biomechanics Studies
- Modeling, Simulation, and Optimization
- Astronomical and nuclear sciences
- Distributed and Parallel Computing Systems
- Inertial Sensor and Navigation
- Historical Astronomy and Related Studies
- Astrophysical Phenomena and Observations
- Space Exploration and Technology
- Phase Equilibria and Thermodynamics
- Mathematics and Applications
Institut d'Estudis Espacials de Catalunya
2018-2024
Universitat de Barcelona
2011-2024
Universitat Politècnica de Catalunya
2024
Institut Català de Ciències del Clima
2010-2022
Institut de Ciències del Cosmos
2018-2022
European Space Research and Technology Centre
2014-2020
Max Planck Society
2018
University of Groningen
2011-2017
European Space Agency
2014-2016
Hebrew University of Jerusalem
2016
Context. The second Gaia data release (DR2) contains very precise astrometric and photometric properties for more than one billion sources, astrophysical parameters dozens of millions, radial velocities variability information half a million stars from selected classes, orbits thousands solar system objects. Aims. Before the catalogue was published, these have undergone dedicated validation processes. goal this paper is to describe results in terms completeness, accuracy, precision various...
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...
Data Release 5 (DR5) of the Radial Velocity Experiment (RAVE) is fifth data release from a magnitude-limited (9< I < 12) survey stars randomly selected in southern hemisphere. The RAVE medium-resolution spectra ($R\sim7500$) covering Ca-triplet region (8410-8795\AA) span complete time frame start observations 2003 to their completion 2013. velocities 520,781 457,588 unique are presented, which 255,922 stellar have parallaxes and proper motions Tycho-Gaia astrometric solution (TGAS) Gaia DR1....
Context. The third Gaia data release is published in two stages. early part, EDR3, gives very precise astrometric and photometric properties for nearly billion sources together with seven million radial velocities from DR2. full release, DR3, will add velocities, spectra, light curves, astrophysical parameters a large subset of the sources, as well orbits solar system objects. Aims. Before publication catalogue, many different items have undergone dedicated validation processes. goal this...
Gaia Data Release 3 (Gaia DR3) contains the second release of combined radial velocities. It is based on spectra collected during first 34 months nominal mission. The longer time baseline and improvements pipeline made it possible to push processing limit, from Grvs = 12 in DR2, 14 mag. In this article, we describe new functionalities implemented for DR3, quality filters applied post-processing properties performance published For several were upgraded or added. (Abridged) DR3 velocities 33...
Combining the precise parallaxes and optical photometry delivered by Gaia's second data release (Gaia DR2) with photometric catalogues of PanSTARRS-1, 2MASS, AllWISE, we derive Bayesian stellar parameters, distances, extinctions for 265 million stars brighter than G=18. Because wide wavelength range used, our results substantially improve accuracy precision previous extinction effective temperature estimates. After cleaning both unreliable input output data, retain 137 stars, which achieve a...
To illustrate the potential of GDR2, we provide a first look at kinematics Milky Way disc, within radius several kiloparsecs around Sun. We benefit for time from sample 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes, and Galactic cylindrical velocities . From this sample, extracted sub-sample 3.2 giant to map velocity field disc $\sim$5~kpc $\sim$13~kpc centre up 2~kpc above below plane. also study distribution 0.3 solar neighbourhood ($r < 200$~pc), median...
We present a catalogue of 362 million stellar parameters, distances, and extinctions derived from Gaia's early third data release (EDR3) cross-matched with the photometric catalogues Pan-STARRS1, SkyMapper, 2MASS, AllWISE. The higher precision Gaia EDR3 data, combined broad wavelength coverage additional surveys new stellar-density priors {\tt StarHorse} code allow us to substantially improve accuracy over previous photo-astrometric stellar-parameter estimates. At magnitude $G=14\, (17)$,...
The third gaia data release (DR3) provides a wealth of new products. early part the release, Gaia EDR3, already provided astrometric and photometric for nearly two billion sources. full now adds improved parameters compared to DR2 radial velocities, astrophysical parameters, variability information, light curves, orbits Solar System objects. improvements are in terms number sources, variety parameter precision, accuracy. For first time, DR3 also sample spectrophotometry spectra obtained with...
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for William Herschel Telescope, will see first light in late 2022. WEAVE comprises a 2-degree field-of-view prime-focus corrector system, nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and single large IFU. These systems feed dual-beam spectrograph covering wavelength range 366$-$959\,nm at $R\sim5000$, or two shorter ranges $R\sim20\,000$. After summarising...
Context. Open clusters are very good tracers of the evolution Galactic disc. Thanks to Gaia, their kinematics can be investigated with an unprecedented precision and accuracy. Aims. The distribution open in 6D phase space is revisited Gaia DR2. Methods. weighted mean radial velocity was determined, using most probable members available from a previous astrometric investigation that also provided parallaxes proper motions. Those parameters, all derived DR2 only, were combined provide...
Non-axisymmetries in the Galactic potential (spiral arms and bar) induce kinematic groups such as Hercules stream. Assuming that is caused by effects of Outer Lindblad Resonance bar, we model analytically its properties a function position Galaxy dependence on bar's pattern speed orientation. Using data from RAVE survey find azimuthal velocity structure decreases Galactocentric radius, manner consistent with our analytical model. This allows us to obtain new estimates parameters Milky Way's...
Using Gaia DR2 astrometry, we map the kinematic signature of Galactic stellar warp out to a distance 7 kpc from Sun. Combining and 2MASS photometry, identify, via probabilistic approach, 599 494 upper main sequence stars 12 616 068 giants without need for individual extinction estimates. The spatial distribution clearly shows segments nearest spiral arms. large-scale kinematics both giant populations show clear Milky Way, apparent as gradient 5-6 km/s in vertical velocities 8 14 radius....
Open Clusters (OCs) can trace with a great accuracy the evolution of Galactic disk. The aim this work is to study kinematical behavior OC population over time. We take advantage latest age determinations OCs investigate correlations 6D phase space coordinates and orbital properties age. also rotation curve Milky Way traced by we compare it that other observational or theoretical studies. gathered nearly 30000 Radial Velocity (RV) measurements members from both Gaia-RVS data ground based...
Context. The β Pictoris moving group is one of the most well-known young associations in solar neighbourhood and several members are known to host circumstellar discs, planets, comets. Measuring its age precisely essential study astrophysical processes, such as planet formation disc evolution, which strongly age-dependent. Aims. We aim determine a precise accurate dynamical traceback for group. Methods. Our sample combines extremely Gaia DR2 astrometry with ground-based radial velocities...
Gaia DR2 has delivered full-sky 6-D measurements for millions of stars, and the quest to understand dynamics our Galaxy entered a new phase. Our aim is reveal characterize kinematic sub-structure different Galactic neighbourhoods, form picture their spatial evolution that can be used infer potential, its components. We take ~5 million stars in disk from catalogue build velocity distribution many Neighbourhoods distributed along 5 kpc radius azimuth. decompose V_R-V_phi plane with wavelet...
We aim to demonstrate the scientific potential of Gaia Early Data Release 3 (EDR3) for study Milky Way structure and evolution. used astrometric positions, proper motions, parallaxes, photometry from EDR3 select different populations components calculate distances velocities in direction anticentre. explore disturbances current disc, spatial kinematical distributions early accreted versus in-situ stars, structures outer parts orbits open clusters Berkeley 29 Saurer 1. find that: i) dynamics...
Gaia DR3 opens a new era of all-sky spectral analysis stellar populations thanks to the nearly 5.6 million stars observed by RVS and parametrised GSP-spec module. The chemical cartography allows powerful precise chemo-dynamical view Milky Way with unprecedented spatial coverage statistical robustness. First, it reveals strong vertical symmetry Galaxy flared structure disc. Second, kinematic disturbances disc -- seen as phase space correlations or orbital substructures are associated patterns...
Over the last few years, many studies have found an empirical relationship between abundance of a star and its age. Here we estimate spectroscopic stellar ages for 178 825 red-giant stars observed by APOGEE survey with median statistical uncertainty 17%. To this end, use supervised machine learning technique XGBoost , trained on high-quality dataset 3060 red-clump asteroseismic both Kepler . After verifying obtained age estimates independent catalogues, investigate some classical chemical,...
We study the phase space available to local stellar distribution using a Galactic potential consistent with several recent observational constraints. find that induced structure has observable consequences. The spiral arm contribution kinematic in solar neighborhood may be as important one produced by bar. suggest some of groups neighborhood, such Hercules and branches, can created dynamical resonances self-gravitating arms not exclusively A coincident Arcturus group is developed when hot...
We study the spiral arm influence on solar neighbourhood stellar kinematics. As nature of Milky Way (MW) arms is not completely determined, we two models: Tight-Winding Approximation (TWA) model, which represents a local approximation, and model with self-consistent material named sPiral potEntial foRmed by obLAte Spheroids (PERLAS). This mass distribution more abrupt gravitational forces. perform test particle simulations after tuning models to observational range for MW properties. find...