Search Publications
PENELLOPE: The ESO data legacy program to complement the Hubble UV Legacy Library of Young Stars (ULLYSES). I. Survey presentation and accretion properties of Orion OB1 and σ-Orionis
Lodato, G.; France, K.; Mendigutía, I. +69 more
The evolution of young stars and disks is driven by the interplay of several processes, notably the accretion and ejection of material. These processes, critical to correctly describe the conditions of planet formation, are best probed spectroscopically. Between 2020 and 2022, about 500orbits of the Hubble Space Telescope (HST) are being devoted i…
Stringent upper limit on Be star fractions produced by binary interaction
Wang, C.; Milone, A. P.; Schootemeijer, A. +2 more
Context. Binary evolution can result in fast-rotating stars through accretion of angular momentum during mass-transfer phases. These fast-rotating stars are predicted to be observable as Be stars. Current models struggle to produce a satisfactory description of Be star populations, even though numerous pieces of observational evidence indicate tha…
CON-quest. Searching for the most obscured galaxy nuclei
Greve, T. R.; Gallagher, J. S.; Onishi, K. +28 more
Context. Some luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) host extremely compact (r < 100 pc) and dusty nuclei. The high extinction associated with large column densities of gas and dust toward these objects render them hard to detect at many wavelengths. The intense infrared radiation arising from warm dust in these sources…
The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS
Guterman, P.; Alonso, R.; Deleuil, M. +78 more
AU Mic is a young planetary system with a resolved debris disc showing signs of planet formation and two transiting warm Neptunes near mean-motion resonances. Here we analyse three transits of AU Mic b observed with the CHaracterising ExOPlanet Satellite (CHEOPS), supplemented with sector 1 and 27 Transiting Exoplanet Survey Satellite (TESS) photo…
Diversity of nuclear star cluster formation mechanisms revealed by their star formation histories
Hilker, M.; Pinna, F.; de Zeeuw, P. T. +15 more
Nuclear star clusters (NSCs) are the densest stellar systems in the Universe and are found in the centres of all types of galaxies. They are thought to form via mergers of star clusters such as ancient globular clusters (GCs) that spiral to the centre as a result of dynamical friction or through in situ star formation directly at the galaxy centre…
Constraining stellar evolution theory with asteroseismology of γ Doradus stars using deep learning. Stellar masses, ages, and core-boundary mixing
Aerts, C.; Van Reeth, T.; Mombarg, J. S. G.
Context. The efficiency of the transport of angular momentum and chemical elements inside intermediate-mass stars lacks proper calibration, thereby introducing uncertainties on a star's evolutionary pathway. Improvements require better estimation of stellar masses, evolutionary stages, and internal mixing properties.
Aims: Our aim was to deve…
1D atmospheric study of the temperate sub-Neptune K2-18b
Bézard, B.; Charnay, B.; Blain, D.
Context. The atmospheric composition of exoplanets with masses between 2 and 10 M⊕ is poorly understood. In that regard, the sub-Neptune K2-18b, which is subject to Earth-like stellar irradiation, offers a valuable opportunity for the characterisation of such atmospheres. Previous analyses of its transmission spectrum from the Kepler, H…
The all-sky PLATO input catalogue
Heras, A. M.; Deleuil, M.; Rauer, H. +29 more
Context. The ESA PLAnetary Transits and Oscillations of stars (PLATO) mission will search for terrestrial planets in the habitable zone of solar-type stars. Because of telemetry limitations, PLATO targets need to be pre-selected.
Aims: In this paper, we present an all sky catalogue that will be fundamental to selecting the best PLATO fields a…
pyUPMASK: an improved unsupervised clustering algorithm
Moitinho, A.; Perren, G. I.; Pera, M. S. +2 more
Aims: We present pyUPMASK, an unsupervised clustering method for stellar clusters that builds upon the original UPMASK package. The general approach of this method makes it plausible to be applied to analyses that deal with binary classes of any kind as long as the fundamental hypotheses are met. The code is written entirely in Python and is …
Local spiral structure based on the Gaia EDR3 parallaxes
Hao, C. J.; Xu, Y.; Hou, L. G. +4 more
Context. The astrometric satellite Gaia is expected to significantly increase our knowledge as to the properties of the Milky Way. The Gaia Early Data Release 3 (EDR3) provides the most precise parallaxes for many OB stars, which can be used to delineate the Galactic spiral structure.
Aims: We investigate the local spiral structure with the l…