Search Publications
Spatially resolved mass-metallicity relation at z ∼ 0.26 from the MUSE-Wide Survey
Lin, Zesen; Chen, Guangwen; Kong, Xu +5 more
Aims: Galaxies in the local universe have a spatially resolved star-forming main sequence (rSFMS) and mass-metallicity relation (rMZR). We know that the global mass-metallicity relation (MZR) results from the integral of the rMZR, and it evolves with redshift. However, the evolution of the rMZR with redshift is still unclear because the spati…
Precise mass determination for the keystone sub-Neptune planet transiting the mid-type M dwarf G 9-40
Kuzuhara, M.; Tamura, M.; Kudo, T. +45 more
Context. Despite being a prominent subset of the exoplanet population discovered in the past three decades, the nature and provenance of sub-Neptune-sized planets is still one of the open questions in exoplanet science.
Aims: For planets orbiting bright stars, precisely measuring the orbital and planet parameters of the system is the best app…
Physical properties of more than one thousand brightest cluster galaxies detected in the Canada-France-Hawaii Telescope Legacy Survey
Durret, F.; Márquez, I.; Sarron, F. +1 more
Context. Brightest cluster galaxies (BCGs) are very massive elliptical galaxies found at the centres of clusters. Their study gives clues to the formation and evolution of the clusters in which they are embedded.
Aims: We analyse here in a homogeneous way the properties of a sample of more than 1000 BCGs in the redshift range 0.15 < z <…
HD 20329b: An ultra-short-period planet around a solar-type star found by TESS
Pallé, E.; Dai, F.; Gandolfi, D. +45 more
Context. Ultra-short-period (USP) planets are defined as planets with orbital periods shorter than one day. This type of planets is rare, highly irradiated, and interesting because their formation history is unknown.
Aims: We aim to obtain precise mass and radius measurements to confirm the planetary nature of a USP candidate found by the Tra…
A new low-luminosity globular cluster discovered in the Milky Way with the VVVX survey
Minniti, D.; Fernández-Trincado, J. G.; Alonso-García, J. +4 more
Context. The VISTA Variables in the Via Láctea Extended Survey (VVVX) allows us to probe previously unexplored regions of the inner Milky Way (MW), especially those that are affected by stellar crowding and strong extinction.
Aims: Our long-term goal is to identify new star clusters and investigate them to reveal their true nature. In particu…
99 oscillating red-giant stars in binary systems with NASA TESS and NASA Kepler identified from the SB9-Catalogue
García, R. A.; Mathis, S.; Mathur, S. +6 more
Oscillating red-giant stars in binary systems are an ideal testbed for investigating the structure and evolution of stars in the advanced phases of evolution. With 83 known red giants in binary systems, of which only ∼40 have determined global seismic parameters and orbital parameters, the sample is small compared to the numerous known oscillating…
Gaia-predicted brown dwarf detection rates around FGK stars in astrometry, radial velocity, and photometric transits
Holl, B.; Lindegren, L.; Perryman, M. +2 more
Context. After more than two decades of relevant radial velocity surveys, the current sample of known brown dwarfs (BDs) around FGK stars is only of the order of 100, limiting our understanding of their occurrence rate, properties, and formation. The ongoing ESA mission Gaia has already collected more than its nominal 5 years of mission data, and …
Impact of the image alignment over frequency for the VLBI Global Observing System
Xu, Ming H.; Savolainen, Tuomas; Anderson, James M. +4 more
Aims: The VLBI Global Observing System (VGOS), which is the next generation of geodetic very long baseline interferometry (VLBI), observes simultaneously in four frequency bands in the range 3.0-10.7 GHz (expected to be extended to 14 GHz). Because source structure changes with frequency, we aim to study the source position estimates from the…
Theoretical analysis of surface brightness-colour relations for late-type stars using MARCS model atmospheres
Plez, B.; Nardetto, N.; Mourard, D. +1 more
Context. Surface brightness-colour relations (SBCRs) are largely used for general studies in stellar astrophysics and for determining extragalactic distances. Based on a careful selection of stars and a homogeneous methodology, it has been recently shown that the SBCR for late-type stars depends on the spectral type and luminosity class.
Aims…
Fundamental stellar parameters of benchmark stars from CHARA interferometry. II. Dwarf stars
White, T. R.; Casagrande, L.; Nordlander, T. +3 more
Context. Stellar models applied to large stellar surveys of the Milky Way need to be properly tested against a sample of stars with highly reliable fundamental stellar parameters. We have established a programme aiming to deliver such a sample of stars.
Aims: Here we present new fundamental stellar parameters of nine dwarf stars that will be …