Search Publications
Wide binaries demonstrate the consistency of rotational evolution between open cluster and field stars
Gruner, D.; Barnes, S. A.; Janes, K. A.
Context. Gyrochronology enables the derivation of ages of late-type main sequence stars based on their rotation periods and a mass proxy, such as color. It has been explored in open clusters, but a connection to field stars has yet to be successfully established.
Aims: We explore the rotation rates of wide binaries, representing enlightening …
Asteroseismic age constraints on the open cluster NGC 2477 using oscillating stars identified with TESS FFI
Creevey, O. L.; Palakkatharappil, D. B.
Context. Asteroseismology is one of the few methods to derive ages of individual stars due to the high precision of their observations. Isochrone fitting is a powerful alternative method for deriving ages by studying clusters of stars. Pulsating stars in clusters should therefore allow for detailed studies of the stellar models.
Aims: Our obj…
Multipoint study of the energy release and transport in the 28 March 2022, M4 flare using STIX, EUI, and AIA during the first Solar Orbiter nominal mission perihelion
Krucker, Säm; Veronig, Astrid M.; Dissauer, Karin +8 more
Context. The Spectrometer Telescope for Imaging X-rays (STIX) on board Solar Orbiter enables exciting multipoint studies of energy release and transport in solar flares by observing the Sun from many different distances and vantage points out of the Sun-Earth line.
Aims: We present a case study of an M4-class flare that occurred on 28 March 2…
The VISCACHA survey. VIII. Chemical evolution history of the Small Magellanic Cloud west halo clusters
Minniti, D.; Bica, E.; Maia, F. +12 more
The chemical evolution history of the Small Magellanic Cloud (SMC) has been a matter of debate for decades. The challenges in understanding the SMC chemical evolution are related to a very slow star formation rate (SFR) combined with bursts triggered by the multiple interactions between the SMC and the Large Magellanic Cloud, a significant (∼0.5 d…
The structural properties of multiple populations in the dynamically young globular cluster NGC 2419
Vesperini, Enrico; Cadelano, Mario; Dalessandro, Emanuele +3 more
NGC 2419 is likely the globular cluster (GC) with the lowest dynamical age in the Galaxy. This makes it an extremely interesting target for studying the properties of its multiple populations (MPs), as they are likely to have been affected only modestly by long-term dynamical evolution effects. Here we present for the first time a detailed analysi…
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…