Search Publications
Weak-lensing mass reconstruction using sparsity and a Gaussian random field
Starck, J. -L.; Peel, A.; Jeffrey, N. +2 more
Aims: We introduce a novel approach to reconstructing dark matter mass maps from weak gravitational lensing measurements. The cornerstone of the proposed method lies in a new modelling of the matter density field in the Universe as a mixture of two components: (1) a sparsity-based component that captures the non-Gaussian structure of the fiel…
The long period of 3He-rich solar energetic particles measured by Solar Orbiter 2020 November 17-23
Lario, D.; Maksimovic, M.; Vecchio, A. +31 more
We report observations of a relatively long period of 3He-rich solar energetic particles (SEPs) measured by Solar Orbiter. The period consists of several well-resolved ion injections. The high-resolution STEREO-A imaging observations reveal that the injections coincide with extreme ultraviolet jets and brightenings near the east limb, n…
NGTS-14Ab: a Neptune-sized transiting planet in the desert
Bouchy, F.; Erikson, A.; Rauer, H. +35 more
Context. The sub-Jovian, or Neptunian, desert is a previously identified region of parameter space where there is a relative dearth of intermediate-mass planets with short orbital periods.
Aims: We present the discovery of a new transiting planetary system within the Neptunian desert, NGTS-14.
Methods: Transits of NGTS-14Ab were discover…
First observations and performance of the RPW instrument on board the Solar Orbiter mission
Müller, D.; Hellinger, P.; André, M. +107 more
The Radio and Plasma Waves (RPW) instrument on the ESA Solar Orbiter mission is designed to measure in situ magnetic and electric fields and waves from the continuum up to several hundred kHz. The RPW also observes solar and heliospheric radio emissions up to 16 MHz. It was switched on and its antennae were successfully deployed two days after the…
Discovery of new globular clusters in the Sagittarius dwarf galaxy
Minniti, D.; Rejkuba, M.; Ripepi, V. +14 more
Context. Globular clusters (GCs) are witnesses of the past accretion events onto the Milky Way. In particular, the GCs of the Sagittarius (Sgr) dwarf galaxy are important probes of an on-going merger.
Aims: Our main goal is to search for new GC members of this dwarf galaxy using the VISTA Variables in the Via Lactea Extended Survey (VVVX) nea…
The complex multi-component outflow of the Seyfert galaxy NGC 7130
Knapen, J. H.; Comerón, S.; Ramos Almeida, C. +1 more
Active galactic nuclei (AGN) are a key ingredient for understanding galactic evolution, as their activity is coupled to the host galaxy properties through feedback processes. AGN-driven outflows are one of the manifestations of this feedback. The laser guide star adaptive optics mode for MUSE at the VLT now permits us to study the innermost tens o…
Aggregates of clusters in the Gaia data
Paunzen, E.; Piecka, M.
Context. The precision of the parallax measurements by Gaia is unprecedented. As of Gaia Data Release 2, the number of known nearby open clusters has increased. Some of the clusters appear to be relatively close to each other and form aggregates, which makes them interesting objects to study.
Aims: We study the aggregates of clusters which sh…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). VIII. Modeling ram pressure stripping of diffuse gas in the Virgo cluster spiral galaxy NGC 4330
Boquien, M.; Soida, M.; Boselli, A. +7 more
NGC 4330 is one of the Virgo galaxies whose UV emission distributions show a tail structure. An associated tail structure is also observed in the HI and Hα emission distributions. Previous dynamical modeling has shown that the galaxy is approaching the cluster center and is therefore undergoing increasing ram pressure stripping. Recent stellar pop…
Lucky spectroscopy, an equivalent technique to lucky imaging. II. Spatially resolved intermediate-resolution blue-violet spectroscopy of 19 close massive binaries using the William Herschel Telescope
Simón-Díaz, S.; Maíz Apellániz, J.; Negueruela, I. +5 more
Context. Many massive stars have nearby companions. These hamper a characterization of massive stars through spectroscopy.
Aims: We continue to obtain spatially resolved spectroscopy of close massive visual binaries to derive their spectral types.
Methods: We used the lucky spectroscopy technique to obtain a large number of short long-sl…
Possible single-armed spiral in the protoplanetary disk around HD 34282
Ménard, F.; van der Plas, G.; Avenhaus, H. +17 more
Context. During the evolution of protoplanetary disks into planetary systems we expect to detect signatures that trace mechanisms such as planet-disk interaction. Protoplanetary disks display a large variety of structures in recently published high-spatial resolution images. However, the three-dimensional morphology of these disks is often difficu…