Search Publications
Population of giant planets around B stars from the first part of the BEAST survey
Helled, R.; Henning, Th.; Mayer, L. +23 more
Context. Exoplanets form from circumstellar protoplanetary disks whose fundamental properties (notably their extent, composition, mass, temperature, and lifetime) depend on the host star properties, such as their mass and luminosity. B stars are among the most massive stars and their protoplanetary disks test extreme conditions for exoplanet forma…
Chandra Survey in the AKARI deep field at the North Ecliptic Pole: Optical and near-infrared identifications of X-ray sources
Malkan, M. A.; Ohyama, Y.; Takagi, T. +17 more
Aims. We present a catalog of optical and infrared (NIR) identifications (ID) of X-ray sources in the AKARI North Ecliptic Pole (NEP) deep field detected with Chandra, covering ~0.34 deg2 and with 0.5–2 keV flux limits ranging between ~2–20 × 10‑16 erg s‑1 cm‑2. Methods. The optical/NIR counterparts of t…
Associating LOFAR Galactic Faraday structures with the warm neutral medium
Boulanger, F.; Jenkins, E. B.; Bracco, A. +4 more
Faraday tomography observations with the Low Frequency Array (LOFAR) have unveiled a remarkable network of structures in polarized synchrotron emission at high Galactic latitudes. The observed correlation between LOFAR structures, dust polarization, and HI emission suggests a connection to the neutral interstellar medium (ISM). We investigated thi…
ViCTORIA project: The LOFAR-MeerKAT view of active galactic nuclei in Virgo cluster early-type galaxies
Boselli, A.; Fossati, M.; Röttgering, H. J. A. +8 more
Context. The evolution of active galactic nuclei (AGNs) is closely connected to their host galaxies and surroundings. Via feedback processes, AGNs can counteract the cooling of the intracluster medium (ICM) and suppress star formation in their host galaxies. Radio observations at low frequencies provide a glimpse into the history of AGN activity. …
High speed stars. III. Detailed abundances and binary nature of the extreme speed star GHS143
Bonifacio, P.; Caffau, E.; Spite, M. +8 more
Context. The Gaia satellite has provided the community with three releases containing astrometrical and photometric data as well as by products, such as stellar parameters and variability indicators.
Aims: By selecting in the Gaia database, one can select stars with the requested characteristics, such as high speed. At present any selection i…
3D structure of the Milky Way out to 10 kpc from the Sun: Catalogue of large molecular clouds in the Galactic Plane
Henning, Thomas; Beuther, Henrik; Miville-Deschênes, Marc-Antoine +4 more
Understanding the 3D structure of the Milky Way is a crucial step in deriving properties of the star-forming regions, as well as the Galaxy as a whole. We present a novel 3D map of the Milky Way plane that extends to 10 kpc distance from the Sun. We leverage the wealth of information in the near-infrared dataset of the Sloan Digital Sky Survey's A…
Solar wind entry into Mercury's magnetosphere: Simulation results for the second swingby of BepiColombo
Narita, Y.; Motschmann, U.; Exner, W. +7 more
Context. We use a global 3D hybrid plasma model to investigate the interaction between Mercury's magnetosphere and the solar wind for the second BepiColombo swingby, evaluate magnetospheric regions, and study the typical energy profile of protons.
Aims: The objective of this study is to gain a better understanding of solar wind entry and anal…
Sufficiency of near-surface water ice as a driver of dust activity on comets: Rethinking the old enigma
Küppers, M.; Thomas, N.; Hartogh, P. +6 more
Context. Nearly all contemporary theoretical research on cometary dust activity relies on models depicting heat transfer and sublimation products within the near-surface porous layer. Gas flow exerts a pressure drag to the crust agglomerates, counteracting weak gravity and the tensile strength of that layer. Our interpretation of data from the Ros…
Detailed chemical abundances of the globular cluster Terzan 6 in the inner bulge
Dalessandro, E.; Massari, D.; Rich, R. M. +7 more
We used near-infrared spectroscopy at medium-high resolution (R = 8000 − 25 000) to perform the first comprehensive chemical study of the intermediate luminosity bulge globular cluster Terzan 6. We derived detailed abundances and abundance patterns of 27 giant stars, likely members of Terzan 6, based on their accurate Hubble Space Telescope proper…
Seismic differences between solar magnetic cycles 23 and 24 for low-degree modes
García, R. A.; Mathur, S.; Salabert, D. +4 more
Solar magnetic activity follows regular cycles of about 11 years with an inversion of polarity in the poles every ∼22 years. This changing surface magnetism impacts the properties of the acoustic modes. The acoustic mode frequency shifts are a good proxy of the magnetic cycle. In this Letter we investigate solar magnetic activity cycles 23 and 24 …