Search Publications
In-flight validation of the Metis visible-light polarimeter coronagraph on board Solar Orbiter
Sasso, C.; Romoli, M.; Andretta, V. +21 more
Context. The Metis coronagraph is one of the remote sensing instruments of the ESA-NASA Solar Orbiter mission. The goal for the instrument is to enable the study of the solar atmosphere and solar wind by simultaneously acquiring images of the solar corona at two different wavelengths: visible light (VL), within a band ranging from 580 nm to 640 nm…
Modeling CME encounters at Parker Solar Probe with OSPREI: Dependence on photospheric and coronal conditions
Al-Haddad, Nada; Riley, Pete; Palmerio, Erika +2 more
Context. Coronal mass ejections (CMEs) are eruptions of plasma from the Sun that travel through interplanetary space and may encounter Earth. CMEs often enclose a magnetic flux rope (MFR), the orientation of which largely determines the CMEs' geoeffectiveness. Current operational CME models do not model MFRs, but a number of research ones do, incl…
A study of carbon-rich post-AGB stars in the Milky Way to understand the production of carbonaceous dust from evolved stars
Dell'Agli, F.; Tailo, M.; Ventura, P. +5 more
Context. Knowledge of the Gaia, DR3 parallaxes of Galactic post-asymptotic giant branch (AGB) stars makes it possible to exploit these objects as tracers of AGB evolution, nucleosynthesis, and dust production as well as to use them to shed new light on still poorly known physical processes experienced by AGB stars.
Aims: The goal of this stud…
TOI-2084 b and TOI-4184 b: Two new sub-Neptunes around M dwarf stars
Alonso, R.; Bouchy, F.; Queloz, D. +67 more
We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolut…
Spectroscopic substellar initial mass function of NGC 2244
Bayo, A.; Peña Ramírez, K.; Bouy, H. +10 more
Context. The dominant formation channel of brown dwarfs (BDs) is not well constrained yet and a promising way to discriminate between scenarios is to test the environment-dependent efficiency in forming BDs. So far, the outcome of star formation, studied through the initial mass function, has been found to be very similar in all clusters that have…
Flybys in debris disk systems with Gaia eDR3
Kim, M.; Roccatagliata, V.; Bertini, L.
Context. Debris disks represent the last phase of the evolution of protoplanetary disks around young stellar objects where planetary systems had most likely already been formed. Resolved systems show peculiar structures, such as asymmetries or spirals, which may be associated with either the presence of a low-mass companion or dynamical interactio…
SHOTGLAS. II. MUSE spectroscopy of blue horizontal branch stars in the core of ω Centauri and NGC6752
Dreizler, S.; Heber, U.; Latour, M. +5 more
Aims: We want to study the population of blue horizontal branch (HB) stars in the centres of globular clusters (GC) for the first time by exploiting the unique combination of MUSE spectroscopy and HST photometry. In this work, we characterize their properties in the GCs ω Cen and NGC 6752.
Methods: We use dedicated model atmospheres and …
A multiple spacecraft detection of the 2 April 2022 M-class flare and filament eruption during the first close Solar Orbiter perihelion
Williams, D.; Woch, J.; Barczynski, K. +56 more
Context. The Solar Orbiter mission completed its first remote-sensing observation windows in the spring of 2022. On 2 April 2022, an M-class flare followed by a filament eruption was seen both by the instruments on board the mission and from several observatories in Earth's orbit, providing an unprecedented view of a flaring region with a large ra…
Extreme-ultraviolet brightenings in the quiet Sun: Signatures in spectral and imaging data from the Interface Region Imaging Spectrograph
Barczynski, K.; Peter, H.; Zhukov, A. N. +13 more
Context. Localised transient EUV brightenings, sometimes named `campfires', occur throughout the quiet Sun. However, there are still many open questions about these events, in particular regarding their temperature range and dynamics.
Aims: We aim to determine whether any transition region response can be detected for small-scale extreme-ultr…
Application of a neural network classifier for the generation of clean Small Magellanic Cloud stellar samples
Luri, X.; Masana, E.; Jiménez-Arranz, Ó. +1 more
Context. Previous attempts to separate Small Magellanic Cloud (SMC) stars from the Milky Way (MW) foreground stars are based only on the proper motions of the stars.
Aims: In this paper, we aim to develop a statistical classification technique to effectively separate the SMC stars from the MW stars using a wider set of Gaia data. We aim to re…