Search Publications
Discovery of a cold giant planet and mass measurement of a hot super-Earth in the multi-planetary system WASP-132
Bayliss, Daniel; Armstrong, David J.; Lendl, Monika +25 more
Hot Jupiters generally do not have nearby planet companions, as they may have cleared out other planets during their inward migration from more distant orbits. This gives evidence that hot Jupiters more often migrate inward via high-eccentricity migration due to dynamical interactions between planets rather than more dynamically cool migration mec…
Multiplicity of Galactic Cepheids from long-baseline interferometry: V. High-accuracy orbital parallax and mass of SU Cygni
Kervella, P.; Mérand, A.; Schaefer, G. H. +23 more
Aims. We aim to accurately measure the dynamical mass and distance of Cepheids by combining radial velocity measurements with interferometric observations. Cepheid mass measurements are particularly necessary for solving the Cepheid mass discrepancy, while independent distance determinations provide a crucial test of the period–luminosity relation…
eRO-ExTra: eROSITA extragalactic non-AGN X-ray transients and variables in eRASS1 and eRASS2
Shirley, R.; Salvato, M.; Liu, Z. +20 more
Aims. The eROSITA telescope aboard the Spectrum Roentgen Gamma (SRG) satellite provides an unprecedented opportunity to explore the transient and variable extragalactic X-ray sky due to the sensitivity, sky coverage, and cadence of the all-sky survey. While previous studies showed the dominance of regular active galactic nuclei (AGN) variability, …
Tracing the Milky Way spiral arms with 26Al: The role of nova systems in the 2D distribution of 26Al
Della Valle, M.; Matteucci, F.; Spitoni, E. +2 more
Context. Massive stars are one of the most important and investigated astrophysical production sites of 26Al, a short-lived radioisotope with an ~1 Myr half-life. Its short lifetime prevents us from observing its complete chemical history, and only the 26Al that was recently produced by massive stars can be observed. Hence, i…
Newborn Be star systems observed shortly after mass transfer
Rivinius, Th.; Buil, C.; Heathcote, B. +24 more
Context. Many classical Be stars acquire their very rapid rotation by mass- and angular-momentum transfer in massive binaries, marking the first phase of the evolutionary chain. Later-stage products, such as Be+subdwarf- and Be+neutron-star binaries (Be X-ray binaries), are also well known, although the search for definitive proof of Be+white dwar…
CARMENES input catalogue of M dwarfs: IX. Multiplicity from close spectroscopic binaries to ultra-wide systems
Amado, P. J.; Caballero, J. A.; Reiners, A. +12 more
Context. Multiplicity studies greatly benefit from focusing on M dwarfs because they are often paired in a variety of configurations with both stellar and substellar objects, including exoplanets. Aims. We aim to address the observed multiplicity of M dwarfs by conducting a systematic analysis using the latest available astropho-tometric data. Met…
Give to Ursa Minor what is Ursa Minor's: An updated census of the RR Lyrae population in the Ursa Minor dwarf galaxy based on Gaia DR3
Clementini, G.; Garofalo, A.; Muraveva, T. +2 more
Aims. We used RR Lyrae stars identified by the Gaia third data release (DR3) to explore the outskirts of the Ursa Minor (UMi) dwarf spheroidal galaxy (dSph) and update the census of its variable star population. Methods. We adopted different tools based on the Gaia DR3 astrometric and photometric data (proper motions, Period–Wesenheit–Metallicity …
SIP-IFVM: Efficient time-accurate magnetohydrodynamic model of the corona and coronal mass ejections
Poedts, S.; Guo, Y.; Guo, J. H. +7 more
Context. Coronal mass ejections (CMEs) are one of the main drivers of space weather. However, robust and efficient numerical modelling applications of the initial stages of CME propagation and evolution process in the sub-Alfvénic corona are still lacking. Aims. Magnetohydrodynamic (MHD) solar coronal models are critical in the Sun-to-Earth model …
The Pristine survey: XXVI. Chemical abundances of subgiant stars of the extremely metal-poor stream C-19
Bonifacio, P.; Caffau, E.; Fouesneau, M. +17 more
Context. The C-19 stellar stream is the most metal-poor stream known to date. While its wth and velocity dispersion indicate a dwarf galaxy origin, its metallicity spread and abundance patterns are more similar to those of globular clusters (GCs). If it is indeed of GC origin, its extremely low metallicity ([Fe/H]=‑3.4, estimated from giant stars)…
The physical properties of cluster chains
Meingast, Stefan; Alves, João; Ratzenböck, Sebastian +5 more
We explore the kinematics and star formation history of the Scorpius Centaurus (Sco-Cen) OB association following the initial identification of sequential, linearly aligned chains of clusters. Building upon our characterization of the Corona Australis (CrA) chain, we now analyze two additional major cluster chains that exhibit similar characterist…