Search Publications
The Gaia-ESO Survey: Chemical tagging in the thin disk. Open clusters blindly recovered in the elemental abundance space
Gilmore, G.; Vallenari, A.; Randich, S. +14 more
Context. The chemical makeup of a star provides the fossil information of the environment where it formed. Under this premise, it should be possible to use chemical abundances to tag stars that formed within the same stellar association. This idea - known as chemical tagging - has not produced the expected results, especially within the thin disk …
A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space telescopes can achieve high photometric accuracy as they are not affected by atmospheric scintillat…
X-raying the Sco-Cen OB association: The low-mass stellar population revealed by eROSITA
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +2 more
We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument on board the Spectrum-Roentgen-Gamma observatory of the Sco-Cen OB association. Bona fide Sco-Cen member stars are young and are therefore expected to emit X-rays at the saturation level. The sensitivity limit of eRASS1 makes these stars detectabl…
Analysis of multiscale structures at the quasi-perpendicular Venus bow shock. Results from Solar Orbiter's first Venus flyby
Maksimovic, M.; Bale, S. D.; Chust, T. +23 more
Context. Solar Orbiter is a European Space Agency mission with a suite of in situ and remote sensing instruments to investigate the physical processes across the inner heliosphere. During the mission, the spacecraft is expected to perform multiple Venus gravity assist maneuvers while providing measurements of the Venusian plasma environment. The f…
Recurrent X-ray flares of the black hole candidate in the globular cluster RZ 2109 in NGC 4472
Lodato, G.; Salvaterra, R.; Tiengo, A. +7 more
We report the systematic analysis of the X-ray observations of the ultraluminous X-ray source
FSR 1776: A new globular cluster in the Galactic bulge?
Minniti, D.; Saito, R. K.; Fernández-Trincado, J. G. +6 more
Context. Recent near-IR surveys have uncovered a plethora of new globular cluster (GC) candidates towards the Milky Way bulge. These new candidates need to be confirmed as real GCs and properly characterised.
Aims: We investigate the physical nature of FSR 1776, a very interesting star cluster projected towards the Galactic bulge. This object…
The GAPS programme at TNG. XXXIV. Activity-rotation, flux-flux relationships, and active-region evolution through stellar age
Baratella, M.; Mallonn, M.; Scandariato, G. +26 more
Context. Active-region evolution plays an important role in the generation and variability of magnetic fields on the surface of lower main sequence stars. However, determining the lifetime of active-region growth and decay as well as their evolution is a complex task. Most previous studies of this phenomenon are based on optical light curves, whil…
Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf
Kuzuhara, M.; Tamura, M.; Kudo, T. +51 more
Context. The NASA space telescope TESS is currently in the extended mission of its all-sky search for new transiting planets. Of the thousands of candidates that TESS is expected to deliver, transiting planets orbiting nearby M dwarfs are particularly interesting targets since they provide a great opportunity to characterize their atmospheres by t…
Lithium, masses, and kinematics of young Galactic dwarf and giant stars with extreme [α/Fe] ratios
Charbonnel, C.; Prantzos, N.; Borisov, S.
Context. Recent spectroscopic explorations of large Galactic stellar samples stars have revealed the existence of red giants with [α/Fe] ratios that are anomalously high, given their relatively young ages.
Aims: We revisit the GALAH DR3 survey to look for both dwarf and giant stars with extreme [α/Fe] ratios, that is, the upper 1% in the [α/F…
Li-rich and super Li-rich giants produced by element diffusion
Shi, Jianrong; Lü, Guoliang; Zhu, Chunhua +4 more
Context. About 0.2−2% of giant stars are Li rich, that is to say their lithium abundance (A(Li)) is higher than 1.5 dex. Nearly 6% of these Li-rich giant stars are super Li rich, with an A(Li) exceeding 3.2 dex. Meanwhile, the formation mechanism of these Li-rich and super Li-rich giants is still under debate.
Aims: Considering the compact He…