Search Publications
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…
Exploring the structure and kinematics of the Milky Way through A stars
Monguió, M.; Figueras, F.; Carrasco, J. M. +2 more
Context. Despite their relatively high intrinsic brightness and the fact that they are more numerous than younger OB stars and kinematically colder than older red giants, A-type stars have rarely been used as Galactic tracers. They may, in fact, be used to fill the age gap between these two tracers, thereby allowing us to evaluate the evolutionary…
Misalignment of the outer disk of DK Tau and a first look at its magnetic field using spectropolarimetry
Donati, J. -F.; Vidotto, A. A.; Bouvier, J. +7 more
Context. Misalignments between a forming star's rotation axis and its outer disk axis, although not predicted by standard theories of stellar formation, have been observed in several classical T Tauri stars (cTTs). The low-mass cTTs DK Tau is suspected of being among them. In addition, it is an excellent subject to investigate the interaction betw…
Magnetic helicity and free magnetic energy as tools for probing eruptions in two differently evolving solar active regions
Georgoulis, M. K.; Nindos, A.; Liokati, E.
Aims: We study the role of magnetic helicity and free magnetic energy in the initiation of eruptions in two differently evolving solar active regions (ARs).
Methods: Using vector magnetograms from the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory and a magnetic connectivity-based method, we calculate the instan…
Solar activity relations in energetic electron events measured by the MESSENGER mission
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +10 more
Aims: We perform a statistical study of the relations between the properties of solar energetic electron (SEE) events measured by the MESSENGER mission from 2010 to 2015 and the parameters of the respective parent solar activity phenomena in order to identify the potential correlations between them. During the time of analysis, the MESSENGER …
VLBI imaging of high-redshift galaxies and protoclusters at low radio frequencies with the International LOFAR Telescope
van Weeren, R. J.; Röttgering, H. J. A.; Miley, G. K. +4 more
It is generally known that luminous, ultra-steep spectrum radio sources are preferentially associated with massive galaxies at high redshifts. In this paper, we describe a pilot project directed at such objects to demonstrate the feasibility and importance of using the LOw-Frequency ARray (LOFAR) data to study the most distant massive galaxies und…