Search Publications
Precise dynamical masses of new directly imaged companions from combining relative astrometry, radial velocities, and HIPPARCOS-Gaia eDR3 accelerations
Zhang, H.; Ségransan, D.; Udry, S. +7 more
Aims: With an observing time span of more than 20 yr, the CORALIE radial-velocity survey is able to detect long-term trends in data corresponding to companions with masses and separations accessible to direct imaging. Combining exoplanet detection techniques, such as radial velocities from the CORALIE survey, astrometric accelerations from HI…
Transit least-squares survey. IV. Earth-like transiting planets expected from the PLATO mission
Heller, René; Samadi, Réza; Harre, Jan-Vincent
In its long-duration observation phase, the PLATO satellite (scheduled for launch in 2026) will observe two independent, non-overlapping fields, nominally one in the northern hemisphere and one in the southern hemisphere, for a total of four years. The exact duration of each pointing will be determined two years before launch. Previous estimates o…
The molecular gas properties in local Seyfert 2 galaxies
Andreani, P.; Pozzi, F.; Hatziminaoglou, E. +8 more
Aims: We present a multiwavelength study of the molecular gas properties of a sample of local Seyfert 2 galaxies to assess if, and to what extent, the presence of an active galactic nucleus (AGN) can affect the interstellar medium (ISM) properties in a sample of 33 local Seyfert 2 galaxies.
Methods: We compare the molecular gas content (…
Substructures, resonances, and debris streams. A new constraint on the inner shape of the Galactic dark halo
Helmi, Amina; Koppelman, Helmer H.; Dodd, Emma
Context. The local stellar halo of the Milky Way contains the debris from several past accretion events.
Aims: Here we study in detail the structure and properties of nearby debris associated with the Helmi streams, which was originally identified as an overdensity in integrals of motion space.
Methods: We use 6D phase-space information …
Milky Way archaeology using RR Lyrae and type II Cepheids. II. High-velocity RR Lyrae stars and Milky Way mass
Hansen, C. J.; Lemasle, B.; Fabrizio, M. +10 more
We report the discovery of high-velocity candidates among RR Lyrae stars found in the Milky Way halo. We identified nine RR Lyrae stars with Galactocentric velocities exceeding the local escape velocity based on the assumed Galaxy potential. Furthermore, based on a close examination of their orbits', we ruled out their ejection location in the Mil…
The ALPINE-ALMA [CII] survey: The population of [CII]-undetected galaxies and their role in the L[CII]-SFR relation
Schaerer, D.; Béthermin, M.; Silverman, J. D. +22 more
The [CII] 158 µm emission line represents one of the most profitable tools for the investigation of the high-redshift galaxies in the early Universe so far. Being one of the brightest cooling lines in the rest-frame far-infrared regime of star-forming galaxies, it has been successfully exploited as a tracer of the star-formation rate (SFR) i…
Data-driven, time-dependent modeling of pre-eruptive coronal magnetic field configuration at the periphery of NOAA AR 11726
Kilpua, E. K. J.; Pomoell, J.; Price, D. J. +4 more
Context. Data-driven, time-dependent magnetofrictional modeling has proved to be an efficient tool for studying the pre-eruptive build-up of energy for solar eruptions, and sometimes even the ejection of coronal flux ropes during eruptions. However, previous modeling works have illustrated the sensitivity of the results on the data-driven boundary…
Signs of late infall and possible planet formation around DR Tau using VLT/SPHERE and LBTI/LMIRCam
Rouan, D.; Ertel, S.; Henning, T. +31 more
Context. Protoplanetary disks around young stars often contain substructures like rings, gaps, and spirals that could be caused by interactions between the disk and forming planets.
Aims: We aim to study the young (1-3 Myr) star DR Tau in the near-infrared and characterize its disk, which was previously resolved through submillimeter interfer…
Westerlund 1 under the light of Gaia EDR3: Distance, isolation, extent, and a hidden population
Maíz Apellániz, J.; Negueruela, I.; Alfaro, E. J. +3 more
Context. The young massive cluster Westerlund 1 offers the promise of a grand laboratory for the study of high-mass star evolution, but its basic parameters are still poorly known.
Aims: In this paper, we aim at a better characterisation of the cluster by determining some basic kinematic properties and analysing the area surrounding the clust…
Diffuse radio emission from non-Planck galaxy clusters in the LoTSS-DR2 fields
Simionescu, A.; Zhang, X.; Di Gennaro, G. +17 more
Context. The presence of large-scale magnetic fields and ultra-relativistic electrons in the intra-cluster medium (ICM) is confirmed through the detection of diffuse radio synchrotron sources, so-called radio halos and relics. Due to their steep-spectrum nature, these sources are rarely detected at frequencies above a few gigahertz, especially in …