Search Publications
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…
Hot subdwarfs in close binaries observed from space. I. Orbital, atmospheric, and absolute parameters, and the nature of their companions
Geier, S.; Pelisoli, I.; Schaffenroth, V. +2 more
Context. About a third of the hot subdwarfs of spectral type B (sdBs), which are mostly core-helium-burning objects on the extreme horizontal branch, are found in close binaries with cool, low-mass stellar, substellar, or white dwarf companions. They can show light variations due to different phenomena.
Aims: Many hot subdwarfs now have space…
Planet populations inferred from debris discs. Insights from 178 debris systems in the ISPY, LEECH, and LIStEN planet-hunting surveys
Gennaro, Mario; Launhardt, Ralf; Kennedy, Grant M. +11 more
We know little about the outermost exoplanets in planetary systems because our detection methods are insensitive to moderate-mass planets on wide orbits. However, debris discs can probe the outer-planet population because dynamical modelling of observed discs can reveal properties of perturbing planets. We use four sculpting and stirring arguments…
Substructure in the stellar halo near the Sun. I. Data-driven clustering in integrals-of-motion space
Koppelman, H. H.; Helmi, A.; Ruiz-Lara, T. +3 more
Context. Merger debris is expected to populate the stellar haloes of galaxies. In the case of the Milky Way, this debris should be apparent as clumps in a space defined by the orbital integrals of motion of the stars.
Aims: Our aim is to develop a data-driven and statistics-based method for finding these clumps in integrals-of-motion space fo…
Low-power jet-interstellar medium interaction in NGC 7319 revealed by JWST/MIRI MRS
Colina, L.; Hönig, S. F.; García-Burillo, S. +8 more
We present JWST/MIRI MRS spectroscopy of NGC 7319, the largest galaxy in the Stephan's Quintet, observed as part of the Early Release Observations (ERO). NGC 7319 hosts a type 2 active galactic nucleus (AGN) and a low-power radio jet (L1.4 GHz = 3.3 × 1022 W Hz−1) with two asymmetric radio hotspots at 430 pc (N2) a…
The first ground-level enhancement of solar cycle 25 on 28 October 2021
Usoskin, I.; Vainio, R.; Gieseler, J. +8 more
Aims: The first relativistic solar proton event of solar cycle 25 was detected on 28 October 2021 by neutron monitors (NMs) on the ground and particle detectors on board spacecraft in near-Earth space. This is the first ground-level enhancement (GLE) of the current cycle. A detailed reconstruction of the NM response together with the identifi…
GOODS-ALMA 2.0: Starbursts in the main sequence reveal compact star formation regulating galaxy evolution prequenching
Magnelli, B.; Daddi, E.; Elbaz, D. +38 more
Compact star formation appears to be generally common in dusty star-forming galaxies (SFGs). However, its role in the framework set by the scaling relations in galaxy evolution remains to be understood. In this work we follow up on the galaxy sample from the GOODS-ALMA 2.0 survey, an ALMA blind survey at 1.1 mm covering a continuous area of 72.42 …