Search Publications
Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program. IV. Carbon and C/O ratios for Galactic stellar populations and planet hosts
Adibekyan, V.; Sousa, S. G.; Santos, N. C. +4 more
Context. To understand the formation and composition of planetary systems, it is essential to have insights into the chemical composition of their host stars. In particular, C/O elemental ratios are useful for constraining the density and bulk composition of terrestrial planets.
Aims: We study the carbon abundances with a twofold objective. O…
A new high-precision strong lensing model of the galaxy cluster MACS J0416.1-2403. Robust characterization of the cluster mass distribution from VLT/MUSE deep observations
Grillo, C.; Tozzi, P.; Rosati, P. +8 more
We present a new high-precision parametric strong lensing model of the galaxy cluster MACS J0416.1-2403, at z = 0.396, which takes advantage of the MUSE Deep Lensed Field (MDLF), with 17.1 h integration in the northeast region of the cluster, and Hubble Frontier Fields data. We spectroscopically identify 182 multiple images from 48 background sour…
First year of energetic particle measurements in the inner heliosphere with Solar Orbiter's Energetic Particle Detector
Kulkarni, S. R.; Lario, D.; Vainio, R. +45 more
Context. Solar Orbiter strives to unveil how the Sun controls and shapes the heliosphere and fills it with energetic particle radiation. To this end, its Energetic Particle Detector (EPD) has now been in operation, providing excellent data, for just over a year.
Aims: EPD measures suprathermal and energetic particles in the energy range from …
CHEOPS precision phase curve of the Super-Earth 55 Cancri e
Guterman, P.; Alonso, R.; Deleuil, M. +79 more
Context. 55 Cnc e is a transiting super-Earth (radius 1.88 R⊕ and mass 8 M⊕) orbiting a G8V host star on a 17-h orbit. Spitzer observations of the planet's phase curve at 4.5 µm revealed a time-varying occultation depth, and MOST optical observations are consistent with a time-varying phase curve amplitude and phase off…
Formation and dynamics of water clouds on temperate sub-Neptunes: the example of K2-18b
Bézard, B.; Charnay, B.; Leconte, J. +3 more
Context. Hubble Space Telescope (HST) spectroscopic transit observations of the temperate sub-Neptune K2-18b were interpreted as the presence of water vapour with potential water clouds. 1D modelling studies also predict the formation of water clouds in K2-18b's atmosphere in some conditions. However, such models cannot predict the cloud cover, wh…
Introducing the LBT Imaging of Galactic Halos and Tidal Structures (LIGHTS) survey. A preview of the low surface brightness Universe to be unveiled by LSST
Trujillo, Ignacio; Sand, David J.; Zaritsky, Dennis +10 more
We present the first results of the LBT Imaging of Galaxy Haloes and Tidal Structures (LIGHTS) survey. LIGHTS is an ongoing observational campaign with the 2 × 8.4 m Large Binocular Telescope (LBT) aiming to explore the stellar haloes and the low surface brightness population of satellites down to a depth of µV ∼ 31 mag arcsec
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). IX. The effects of ram pressure stripping down to the scale of individual HII regions in the dwarf galaxy IC 3476
Ferrarese, L.; Boquien, M.; Galbany, L. +25 more
We study the IB(s)m galaxy IC 3476 observed in the context of the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE), a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT. The deep narrow-band image reveals a very pertubed ionised gas distribution that is characterised by a prominent …
A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776
Fridlund, M.; Pallé, E.; Guenther, E. W. +63 more
We report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M = 0.54 ± 0.03 M ⊙) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TESS). Combining the TESS photometry with HARPS radial velocities, as well as ground-based follow-up…
The Gaia-ESO survey: Mixing processes in low-mass stars traced by lithium abundance in cluster and field stars
Baratella, M.; Gilmore, G.; Bayo, A. +42 more
Aims: We aim to constrain the mixing processes in low-mass stars by investigating the behaviour of the Li surface abundance after the main sequence. We take advantage of the data from the sixth internal data release of Gaia-ESO, IDR6, and from the Gaia Early Data Release 3, EDR3s.
Methods: We selected a sample of main-sequence, sub-giant…
Long-term X-ray spectral evolution of ultraluminous X-ray sources: implications on the accretion flow geometry and the nature of the accretor
Godet, O.; Webb, N.; Olive, J. -F. +2 more
Context. The discovery of pulsations in several ultraluminous X-ray sources (ULXs) has demonstrated that a fraction of them are powered by super-Eddington accretion onto neutron stars (NSs). This has raised questions regarding the NS to black hole (BH) ratio within the ULX population and the physical mechanism that allows ULXs to reach luminositie…