Search Publications
A Gaia astrometric view of the open clusters Pleiades, Praesepe, and Blanco 1
García-Varela, Alejandro; Alfonso, Jeison
Context. Nearby open clusters, such as Pleiades, Praesepe, and Blanco 1, have been extensively studied due to their proximity to the Sun. The Gaia data provide the opportunity to investigate these clusters, because they contain valuable astrometric and photometric information that can be used to update their kinematic and stellar properties.
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New X-ray detections of magnetic period-bounce cataclysmic variables from XMM-Newton and SRG/eROSITA
Stelzer, Beate; Schwope, Axel; de Martino, Domitilla +1 more
Context. A great portion of the cataclysmic variable population, between 40% and 70%, is predicted to be made up of period-bouncers, systems with degenerate donors that have evolved past the period minimum. However, due to their intrinsic faintness, only a few of these systems have been observed and confidently identified so far.
Aims: We hav…
Tidally locked rotation of the dwarf planet (136199) Eris discovered via long-term ground-based and space photometry
Greiner, J.; Pál, A.; Marton, G. +9 more
The rotational states of the members in the dwarf planet-satellite systems in the trans-Neptunian region are determined by formation conditions and the tidal interaction between the components. These rotational characteristics serve as prime tracers of their evolution. A number of authors have claimed a very broad range of values for the rotation …
Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations
Beswick, R.; Covino, S.; D'Avanzo, P. +101 more
We present the results from multi-wavelength observations of a transient discovered during an intensive follow-up campaign of S191213g, a gravitational wave (GW) event reported by the LIGO-Virgo Collaboration as a possible binary neutron star merger in a low latency search. This search yielded SN 2019wxt, a young transient in a galaxy whose sky po…
Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
Hamann, W. -R.; Oey, M. S.; Mehner, A. +16 more
Context. The origin of the observed population of Wolf-Rayet (WR) stars in low-metallicity galaxies, such as the Small Magellanic Cloud (SMC), is not yet understood. Standard, single-star evolutionary models predict that WR stars should stem from very massive O-type star progenitors, but these are very rare. On the other hand, binary evolutionary …
What does a typical full disc around a post-AGB binary look like?. Radiative transfer models reproducing PIONIER, GRAVITY, and MATISSE data
Min, M.; Van Winckel, H.; Kamath, D. +2 more
Context. Stable circumbinary discs around evolved post-asymptotic giant branch (post-AGB) binary systems composed of gas and dust show many similarities with protoplanetary discs around young stellar objects. These discs can provide constraints on both binary evolution and the formation of macrostructures within circumstellar discs. Here we focus …
Investigating the origin of optical and X-ray pulsations of the transitional millisecond pulsar PSR J1023+0038
Campana, S.; Stella, L.; de Martino, D. +21 more
Context. PSR J1023+0038 is the first millisecond pulsar that was ever observed as an optical and UV pulsar. So far, it is the only optical transitional millisecond pulsar. The rotation- and accretion-powered emission mechanisms hardly individually explain the observed characteristics of optical pulsations. A synergistic model, combining these stan…
Oxygen-bearing organic molecules in comet 67P's dusty coma: First evidence for abundant heterocycles
Altwegg, K.; Fuselier, S. A.; Rubin, M. +6 more
The puzzling complexity of terrestrial biomolecules is driving the search for complex organic molecules in the interstellar medium (ISM) and serves as a motivation for many in situ studies of reservoirs of extraterrestrial organics, from meteorites and interplanetary dust particles to comets and asteroids. Comet 67P/Churyumov-Gerasimenko (67P), th…
Multiples among B stars in the Scorpius-Centaurus association
D'Orazi, V.; Nascimbeni, V.; Janson, M. +14 more
Context. The frequency, semi-major axis, and mass distribution of stellar companions likely depend on the mass of the primaries and on the environment where the stars form. These properties are very different for early- and late-type stars. However, data are largely incomplete, even for the closest environments to the Sun, preventing a cleaner vie…
Astrometry in crowded fields towards the Galactic bulge
Minniti, Dante; Rejkuba, Marina; Marchetti, Tommaso +1 more
Context. The astrometry towards the Galactic bulge is hampered by high stellar crowding and patchy extinction. This effect is particularly severe for optical surveys such as the European Space Agency satellite Gala.
Aims: In this study, we assess the consistency of proper motion measurements between optical (Gaia DR3) and near-infrared (VIRAC…