A. Castro-Ginard
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View article: GaiaUnlimited: The old stellar disc of the Milky Way as traced by the red clump
GaiaUnlimited: The old stellar disc of the Milky Way as traced by the red clump Open
We present an exploration of the Milky Way’s structural parameters using an all-sky sample of red clump (RC) giants to map the stellar density from the Galactic disc beyond 3 kpc. These evolved giants are considered to be standard candles …
View article: The completeness of the open cluster census towards the Galactic anticentre
The completeness of the open cluster census towards the Galactic anticentre Open
Context . Open clusters have long been used as tracers of Galactic structure. However, without a selection function to describe the completeness of the cluster census, it is difficult to quantitatively interpret their distribution. Aims . …
View article: A planetary-mass candidate imaged in the Young Suns Exoplanet Survey
A planetary-mass candidate imaged in the Young Suns Exoplanet Survey Open
Context . Directly imaged exoplanets in wide orbits pose a challenge to current gas giant formation theories, as they need to form quickly and acquire enough material before the disc dissipates. These processes cannot be accommodated by in…
View article: Detection and characterization of giant planets with <i>Gaia</i> astrometry
Detection and characterization of giant planets with <i>Gaia</i> astrometry Open
Astrometric observations with Gaia are expected to play a valuable role in future exoplanet surveys. With current data from Gaia’s third data release (DR3), we are sensitive to periods from less than 1 yr to more than 4 yr but, unlike radi…
View article: GaiaUnlimited: The old stellar disc of the Milky Way as traced by the Red Clump
GaiaUnlimited: The old stellar disc of the Milky Way as traced by the Red Clump Open
We present an exploration of the Milky Way's structural parameters using an all-sky sample of RC giants to map the stellar density from the Galactic disc beyond 3 kpc. These evolved giants are considered to be standard candles due to their…
View article: The realm of Aurora. Density distribution of metal-poor giants in the heart of the Galaxy
The realm of Aurora. Density distribution of metal-poor giants in the heart of the Galaxy Open
The innermost portions of the Milky Way's stellar halo have avoided scrutiny until recently. The lack of wide-area survey data, made it difficult to reconstruct an uninterrupted view of the density distribution of the metal-poor stars insi…
View article: <i>Gaia</i> DR3 detectability of unresolved binary systems
<i>Gaia</i> DR3 detectability of unresolved binary systems Open
Context.Gaia cannot individually resolve very close binary systems; however, the collected data can still be used to identify them. A powerful indicator of stellar multiplicity is the sources’ reported re-normalised unit weight error (RUWE…
View article: Gaia DR3 detectability of unresolved binary systems
Gaia DR3 detectability of unresolved binary systems Open
Gaia can not individually resolve very close binary systems, however, the collected data can still be used to identify them. A powerful indicator of stellar multiplicity is the sources reported Renormalized Unit Weight Error (ruwe), which …
View article: Uniting <b><i>Gaia</i></b> and APOGEE to unveil the cosmic chemistry of the Milky Way disc
Uniting <b><i>Gaia</i></b> and APOGEE to unveil the cosmic chemistry of the Milky Way disc Open
The spatial distribution of Galactic stars with different chemical abundances encodes information on the processes that drove the formation and evolution of the Milky Way. Survey selection functions are indispensable for analysing astronom…
View article: Uniting Gaia and APOGEE to unveil the cosmic chemistry of the Milky Way disc
Uniting Gaia and APOGEE to unveil the cosmic chemistry of the Milky Way disc Open
The spatial distribution of Galactic stars with different chemical abundances encodes information on the processes that drove the formation and evolution of the Milky Way. Survey selection functions are indispensable for analysing astronom…
View article: The bar pattern speed of the Large Magellanic Cloud
The bar pattern speed of the Large Magellanic Cloud Open
Context. The internal kinematics of the Large Magellanic Cloud (LMC) have been studied in unprecedented depth thanks to the excellent quality of the Gaia mission data, thus revealing the disc’s non-axisymmetric structure. Aims. We seek to …
View article: The bar pattern speed of the Large Magellanic Cloud
The bar pattern speed of the Large Magellanic Cloud Open
Context: The Large Magellanic Cloud (LMC) internal kinematics have been studied in unprecedented depth thanks to the excellent quality of the Gaia mission data, revealing the disc's non-axisymmetric structure. Aims: We want to constrain th…
View article: Building the largest sample of open cluster masses with Gaia DR3
Building the largest sample of open cluster masses with Gaia DR3 Open
Open clusters (OCs) play a fundamental role in understanding star formation, evolution, and the Milky Way's structure. The ESA space-based mission Gaia has significantly improved our knowledge of OCs and the Milky Way through precise astro…
View article: Constraints on the Galactic centre environment from <i>Gaia</i> hypervelocity stars III: insights on a possible companion to Sgr A*
Constraints on the Galactic centre environment from <i>Gaia</i> hypervelocity stars III: insights on a possible companion to Sgr A* Open
We consider a scenario in which Sgr A* is in a massive black hole binary (MBHB) with an as-of-yet undetected supermassive or intermediate-mass black hole companion. Dynamical encounters between this MBHB and single stars in its immediate v…
View article: Estimating the selection function of <i>Gaia</i> DR3 subsamples
Estimating the selection function of <i>Gaia</i> DR3 subsamples Open
Context. Understanding the intricacies behind the presence and absence of sources in an astronomical catalogue is crucial for the accurate interpretation of astronomical data. In particular, for the multi-dimensional Gaia data, filters and…
View article: A machine-learning-based tool for open cluster membership determination in <i>Gaia</i> DR3
A machine-learning-based tool for open cluster membership determination in <i>Gaia</i> DR3 Open
Context. Membership studies characterising open clusters (OCs) with Gaia data – most of them using Gaia Data Release 2 (DR2) – have so far been limited at the faint end to magnitude G = 18 due to astrometric uncertainties. Aims. Our goal i…
View article: The multiplicity fraction in 202 open clusters from<i>Gaia</i>
The multiplicity fraction in 202 open clusters from<i>Gaia</i> Open
In this study, we estimate the fraction of binaries with high mass ratios for 202 open clusters in the extended solar neighbourhood (closer than 1.5 kpc from the Sun). This is one of the largest homogeneous catalogues of multiplicity fract…
View article: Constraints on the Galactic Centre environment from \textit{Gaia} hypervelocity stars III: Insights on a possible companion to Sgr A*
Constraints on the Galactic Centre environment from \textit{Gaia} hypervelocity stars III: Insights on a possible companion to Sgr A* Open
We consider a scenario in which Sgr A* is in a massive black hole binary (MBHB) with an as-of-yet undetected supermassive or intermediate-mass black hole companion. Dynamical encounters between this MBHB and single stars in its immediate v…
View article: Estimating the selection function of Gaia DR3 sub-samples
Estimating the selection function of Gaia DR3 sub-samples Open
Understanding which sources are present in an astronomical catalogue and which are not is crucial for the accurate interpretation of astronomical data. In particular, for the multidimensional Gaia data, filters and cuts on different parame…
View article: The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation Open
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiple…
View article: The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation
The wide-field, multiplexed, spectroscopic facility WEAVE: Survey design, overview, and simulated implementation Open
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, will see first light in late 2022. WEAVE comprises a new 2-degree field-of-view prime-focus corrector system, a nearly 1000-…
View article: Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects
Spectroscopic Confirmation of a Population of Isolated, Intermediate-mass Young Stellar Objects Open
Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such o…
View article: An empirical model of the<i>Gaia</i>DR3 selection function
An empirical model of the<i>Gaia</i>DR3 selection function Open
Interpreting and modelling astronomical catalogues requires an understanding of the catalogues’ completeness or selection function: what properties determine an object’s probability of being including in the catalogue? Here we set out to e…
View article: Gaia keeps on delivering: expanding the open cluster population with EDR3
Gaia keeps on delivering: expanding the open cluster population with EDR3 Open
The huge improvements in the precision of the published data in Gaia EDR3, particularly for parallaxes and proper motions, has given a push to the detection of new open clusters in the Milky Way. In this talk, I will revise our methodology…
View article: An empirical model of the Gaia DR3 selection function
An empirical model of the Gaia DR3 selection function Open
Interpreting and modelling astronomical catalogues requires an understanding of the catalogues' completeness or selection function: objects of what properties had a chance to end up in the catalogue. Here we set out to empirically quantify…
View article: A new resonance-like feature in the outer disc of the Milky Way
A new resonance-like feature in the outer disc of the Milky Way Open
Modern astrometric and spectroscopic surveys have revealed a wealth of structure in the phase space of stars in the Milky Way, with evidence of resonance features and non-equilibrium processes. Using Gaia's third data release, we present e…
View article: <i>Gaia</i> Data Release 3
<i>Gaia</i> Data Release 3 Open
Context. With the most recent Gaia data release, the 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 mo…
View article: Unravelling UBC 274: A morphological, kinematical, and chemical analysis of a disrupting open cluster
Unravelling UBC 274: A morphological, kinematical, and chemical analysis of a disrupting open cluster Open
Context. Open clusters in the process of disruption help to understand the formation and evolution of the Galactic disk. The wealth and homogeneity of Gaia data have led to the discovery of several open clusters with signs of disruption. D…
View article: Spectroscopic Confirmation of a Population of Isolated, Intermediate-Mass YSOs
Spectroscopic Confirmation of a Population of Isolated, Intermediate-Mass YSOs Open
Wide-field searches for young stellar objects (YSOs) can place useful constraints on the prevalence of clustered versus distributed star formation. The Spitzer/IRAC Candidate YSO (SPICY) catalog is one of the largest compilations of such o…
View article: NGC 1605 is not a Binary Cluster
NGC 1605 is not a Binary Cluster Open
The open star cluster NGC 1605 has recently been reported to in fact consist of two clusters (one intermediate-aged and one old) that merged via a flyby capture. Here we show that Gaia data do not support this scenario. We also report the …