Search Publications
Populations of super-soft X-ray sources in galaxies of different morphological types
Gilfanov, M.; Galiullin, I.
Aims: We study populations of soft and super-soft X-ray sources (SSSs) in nearby galaxies of various morphological types with particular emphasis on characterizing populations of stable nuclear burning, accreting white dwarfs (WDs).
Methods: Analyzing the content of the Chandra archive, we assembled a sample of nearby galaxies suitable f…
HADES RV Programme with HARPS-N at TNG. XIII. A sub-Neptune around the M dwarf GJ 720 A
Rebolo, R.; Ribas, I.; Scandariato, G. +21 more
Context. The high number of super-Earth and Earth-like planets in the habitable zone detected around M-dwarf stars in recent years has revealed these stellar objects to be the key to planetary radial velocity (RV) searches.
Aims: Using the HARPS-N spectrograph within The HArps-n red Dwarf Exoplanet Survey (HADES) we have reached the precision…
A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri
Kriskovics, L.; Oláh, K.; Borkovits, T. +6 more
Context. Late-type stars in close binary systems can exhibit strong magnetic activity owing to rapid rotation supported by tidal locking. On the other hand, tidal coupling may suppress the differential rotation which is a key ingredient of the magnetic dynamo.
Aims: We studied the red dwarf component in the eclipsing binary system V471 Tau in…
Maximum helium content of multiple populations in the globular cluster NGC 6752
Martins, F.; Charbonnel, C.; Chantereau, W.
Context. Multiple populations in globular clusters are usually explained by the formation of stars out of material with a chemical composition that is polluted to different degrees by the ejecta of short-lived, massive stars. But the nature of the "polluters" remains elusive. Different types of stars have been proposed to account for the observed …
Investigating three Sirius-like systems with SPHERE
Rouan, D.; Ménard, F.; Avenhaus, H. +61 more
Context. Sirius-like systems are relatively wide binaries with a separation from a few to hundreds of au; they are composed of a white dwarf (WD) and a companion of a spectral type earlier than M0. Here we consider main sequence (MS) companions, where the WD progenitor evolves in isolation, but its wind during the former asymptotic giant branch (A…
ALMA Lensing Cluster Survey: A spectral stacking analysis of [C II] in lensed z ∼ 6 galaxies
Richard, Johan; Fujimoto, Seiji; Kohno, Kotaro +14 more
Context. The properties of galaxies at redshift z > 6 hold the key to our understanding of the early stages of galaxy evolution and can potentially identify the sources of the ultraviolet radiation that give rise to the epoch of reionisation. The far-infrared cooling line of [C II] at 158 µm is known to be bright and correlate with the st…
Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427-608, HESS J1458-608, and new VHE γ-ray source candidates
Lemoine-Goumard, M.; Vasileiadis, G.; Renaud, M. +1 more
Aims: Among the γ-ray sources discovered at high and very-high energies, a large fraction still lack a clear identification. In particular, the H.E.S.S. Galactic Plane Survey (HGPS) revealed 78 TeV sources among which 47 are not clearly associated with a known object. Multiwavelength data can help identify the origin of the very-high energy γ…
Time evolution of gaps in stellar streams in axisymmetric Stäckel potentials
Helmi, Amina; Koppelman, Helmer H.
Context. When a subhalo interacts with a cold stellar stream, the otherwise nearly smooth distribution of stars is disturbed, and this creates a gap. The properties of these gaps depend on the interaction parameters. Their characterisation could thus lead to a determination of the mass spectrum of the perturbers and might reveal the existence of d…
The key impact of the host star's rotational history on the evolution of TOI-849b
Buldgen, G.; Eggenberger, P.; Bourrier, V. +2 more
Context. TOI-849b is one of the few planets populating the hot-Neptune desert and it is the densest Neptune-sized one discovered so far. Its extraordinary proximity to the host star, together with the absence of a massive H/He envelope on top of the 40.8 M⊕ rocky core, calls into question the role played by the host star in the evolutio…
The dense warm ionized medium in the inner Galaxy
Goldsmith, P. F.; Langer, W. D.; Buchbender, C. +6 more
Context. Ionized interstellar gas is an important component of the interstellar medium and its lifecycle. The recent evidence for a widely distributed highly ionized warm interstellar gas with a density intermediate between the warm ionized medium (WIM) and compact H II regions suggests that there is a major gap in our understanding of the interst…