Search Publications
An inner warp discovered in the disk around HD 110058 using VLT/SPHERE and HST/STIS
Ménard, F.; Milli, J.; Boccaletti, A. +16 more
Context. An edge-on debris disk was detected in 2015 around the young, nearby A0V star HD 110058. The disk showed features resembling those seen in the disk of β Pictoris that could indicate the presence of a perturbing planetary-mass companion in the system.
Aims: We investigated new and archival scattered light images of the disk in order t…
Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5, and Trumpler 20
Bonifacio, P.; Caffau, E.; Monaco, L. +4 more
Context. Sulfur (S) is one of the lesser-studied α-elements. Published investigations of its behavior have so far focused on local stars, and only a few clusters of the Milky Way have been considered to study this topic. We aim to study the S content of the globular cluster Ruprecht 106 - which has never before been studied for this purpose, but i…
The blue supergiant Sher 25 revisited in the Gaia era
Butler, K.; Weßmayer, D.; Przybilla, N. +2 more
Aims: The evolutionary status of the blue supergiant Sher 25 and its membership to the massive cluster NGC 3603 are investigated.
Methods: A hybrid non-local thermodynamic equilibrium (non-LTE) spectrum synthesis approach is employed to analyse a high-resolution optical spectrum of Sher 25 and five similar early B-type comparison stars i…
The effect of variations in the magnetic field direction from turbulence on kinetic-scale instabilities
Verscharen, Daniel; Chen, Christopher H. K.; Opie, Simon +2 more
At kinetic scales in the solar wind, instabilities transfer energy from particles to fluctuations in the electromagnetic fields while restoring plasma conditions towards thermodynamic equilibrium. We investigate the interplay between background turbulent fluctuations at the small-scale end of the inertial range and kinetic instabilities acting to …
Multiple stellar populations found outside the tidal radius of NGC 1851 via Gaia DR3 XP spectra
Milone, Antonino P.; Lagioia, Edoardo P.; Marino, Anna F. +6 more
Aims: Ancient galactic globular clusters (GCs) have long fascinated astronomers due to their intriguing multiple stellar populations (MPs), which are characterized by variations in light element abundances. Among these clusters, type II GCs stand out as they exhibit stars with large differences in heavy-element chemical abundances. These enig…
ZZ Ceti stars of the southern ecliptic hemisphere re-observed by TESS
Sódor, Ádám; Kawaler, Steven D.; Bognár, Zsófia +1 more
Context. In 2020, a publication presented the first-light results for 18 known ZZ Ceti stars observed by the TESS Space Telescope during the first survey observations of the southern ecliptic hemisphere. However, in the meantime, new measurements have become available from this field, in many cases with the new, 20 s ultrashort cadence mode.
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The ultraluminous X-ray source M 81 X-6: a weakly magnetised neutron star with a precessing accretion disc?
Godet, O.; Webb, N. A.; Middleton, M. J. +2 more
Context. Thanks to their proximity, ultraluminous X-ray sources (ULXs) represent a privileged astrophysical laboratory to study super-Eddington accretion. Current open questions concern the nature of the compact object, which is still hard to determine in those cases where pulsations are not directly detected, and the mechanisms responsible for th…
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Liu, N.; Zhu, Z.; Liu, J. -C. +3 more
Context. Pulsars are special objects whose positions can be determined independently from timing, radio interferometric, and Gaia astrometry at sub-milliarcsecond (mas) precision; thus, they provide a unique way to monitor the link between dynamical and kinematic reference frames.
Aims: We aim to assess the orientation consistency between the…
Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b
Smalley, Barry; Triaud, Amaury H. M. J.; Law, Nicholas M. +62 more
While the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report …
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Characterization of the young star T CrA and its circumstellar environment
Lodato, G.; Ménard, F.; Ginski, C. +15 more
Context. In recent years, a new hot topic has emerged in the star and planet formation field, namely, the interaction between the circumstellar disk and its birth cloud. The birth environments of young stars leave strong imprints on the star itself and their surroundings. In this context, we present a detailed analysis of the rich circumstellar en…