Search Publications
A tentative detection of He I in the atmosphere of GJ 1214 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +27 more
The He I λ10833 Å triplet is a powerful tool for characterising the upper atmosphere of exoplanets and tracing possible mass loss. Here, we analysed one transit of GJ 1214 b observed with the CARMENES high-resolution spectrograph to study its atmosphere via transmission spectroscopy around the He I triplet. Although previous studies using lower re…
Irradiation-driven escape of primordial planetary atmospheres. II. Evaporation efficiency of sub-Neptunes through hot Jupiters
Haardt, Francesco; Rauscher, Emily; Malsky, Isaac +3 more
Making use of the publicly available 1D photoionization hydrodynamics code ATES we set out to investigate the combined effects of specific planetary gravitational potential energy (ϕp ≡ GMp/Rp) and stellar X-ray and extreme ultraviolet (XUV) irradiation (FXUV) on the evaporation efficiency (η) of moderat…
Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +4 more
The fundamental properties of the postulated dark matter (DM) affect the internal structure of gravitationally bound structures. In the cold dark matter paradigm, DM particles interact only via gravity. Their distribution is well represented by an Einasto profile with shape parameter α ≈ 0.18 in the smallest dwarf galaxies or the most massive gala…
Survey of Surveys. I. The largest compilation of radial velocities for the Galaxy
Rainer, M.; Marinoni, S.; Randich, S. +8 more
Context. In the present-day panorama of large spectroscopic surveys, the amount, diversity, and complexity of the available data continuously increase. The overarching goal of studying the formation and evolution of our Galaxy is hampered by the heterogeneity of instruments, selection functions, analysis methods, and measured quantities.
Aims…
A SPHERE survey of self-shadowed planet-forming disks
Pinte, C.; Ménard, F.; Avenhaus, H. +20 more
To date, nearly two hundred planet-forming disks have been imaged at high resolution. Our propensity to study bright and extended objects does, however, bias our view of the disk demography. In this work, we aim to help alleviate this bias by analyzing fifteen disks targeted with VLT/SPHERE that look faint in scattered light. Sources were selected…
Godzilla, a monster lurks in the Sunburst galaxy
Diego, J. M.; Kelly, P.; Broadhurst, T. +4 more
We model the strong lensing effect in the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) with an improved version of the hybrid method WSLAP+. We extend the number of constraints by including the position of critical points, which are combined with the classic positional constraints of the lensed galaxies. We pay special attention to a transient ca…
STEPARSYN: A Bayesian code to infer stellar atmospheric parameters using spectral synthesis
Montes, D.; González Hernández, J. I.; Tabernero, H. M. +1 more
Context. STEPARSYN is an automatic code written in Python 3.X designed to infer the stellar atmospheric parameters Teff, log g, and [Fe/H] of FGKM-type stars following the spectral synthesis method.
Aims: We present a description of the STEPARSYN code and test its performance against a sample of late-type stars that were observed w…
Substructure in the stellar halo near the Sun. II. Characterisation of independent structures
Koppelman, H. H.; Helmi, A.; Ruiz-Lara, T. +3 more
Context. In an accompanying paper, we present a data-driven method for clustering in `integrals of motion' space and apply it to a large sample of nearby halo stars with 6D phase-space information. The algorithm identified a large number of clusters, many of which could tentatively be merged into larger groups.
Aims: The goal here is to estab…
Two temperate super-Earths transiting a nearby late-type M dwarf
Tamura, M.; Kudo, T.; Bouchy, F. +82 more
Context. In the age of JWST, temperate terrestrial exoplanets transiting nearby late-type M dwarfs provide unique opportunities for characterising their atmospheres, as well as searching for biosignature gases. In this context, the benchmark TRAPPIST-1 planetary system has garnered the interest of a broad scientific community.
Aims: We report…
First JWST observations of a gravitational lens. Mass model from new multiple images with near-infrared observations of SMACS J0723.3−7327
Brammer, G.; Vanzella, E.; Mercurio, A. +4 more
We present our lens mass model of SMACS J0723.3−7327, the first strong gravitational lens observed by the James Webb Space Telescope (JWST). We use data from the Hubble Space Telescope and the Multi Unit Spectroscopic Explorer (MUSE) to build our `pre-JWST' lens model and then refine it with newly available JWST near-infrared imaging in our JWST m…