Search Publications
A highly dynamic small-scale jet in a polar coronal hole
Teriaca, Luca; Solanki, Sami K.; Schühle, Udo +6 more
We present an observational study of the plasma dynamics at the base of a solar coronal jet, using high resolution extreme ultraviolet imaging data taken by the Extreme Ultraviolet Imager on board Solar Orbiter, and by the Atmospheric Imaging Assembly on board Solar Dynamics Observatory. We observed multiple plasma ejection events over a period of…
The morphology of CS Cha circumbinary disk suggesting the existence of a Saturn-mass planet
Bayo, A.; Ginski, C.; Pinilla, P. +8 more
Context. Planets have been detected in circumbinary orbits in several different systems, despite the additional challenges faced during their formation in such an environment.
Aims: We investigate the possibility of planetary formation in the spectroscopic binary CS Cha by analyzing its circumbinary disk.
Methods: The system was studied …
Lens parameters for Gaia18cbf - a long gravitational microlensing event in the Galactic plane
Mróz, P.; Gromadzki, M.; Narita, N. +29 more
Context. The timescale of a microlensing event scales as a square root of a lens mass. Therefore, long-lasting events are important candidates for massive lenses, including black holes.
Aims: Here, we present the analysis of the Gaia18cbf microlensing event reported by the Gaia Science Alerts system. It exhibited a long timescale and features…
The detection of transiting exoplanets by Gaia
Gomel, Roy; Mazeh, Tsevi; Audard, Marc +14 more
Context. The space telescope Gaia is mainly dedicated to performing high-precision astrometry but is also used to perform spectroscopy and epoch photometry, which can be used to study various types of photometric variability. One such variability type is exoplanetary transits. The photometric data accumulated so far have finally matured enough to …
The importance of Fe fragmentation for LiBeB analyses. Is a Li primary source needed to explain AMS-02 data?
Maurin, D.; Ferronato Bueno, E.; Génolini, Y. +2 more
Context. High-precision data from AMS-02 on Li, Be, and B provide the best constraints on Galactic cosmic-ray transport parameters.
Aims: We re-evaluate the impact of Fe fragmentation on the Li, Be, and B modelling. We discuss the consequences on the transport parameter determination and reassess whether a primary source of Li is needed to ma…
OCCASO. IV. Radial velocities and open cluster kinematics
Jordi, C.; Casamiquela, L.; Cantat-Gaudin, T. +8 more
Context. Open clusters (OCs) are widely used as test particles to investigate a variety of astrophysical phenomena, from stellar evolution to Galactic evolution. Gaia and the complementary massive spectroscopic surveys are providing an unprecedented wealth of information about these systems.
Aims: The Open Cluster Chemical Abundances from Spa…
Validation scheme for solar coronal models: Constraints from multi-perspective observations in EUV and white light
Temmer, M.; Asvestari, E.; Pomoell, J. +2 more
Context. In this paper, we present a validation scheme to investigate the quality of coronal magnetic field models, which is based on comparisons with observational data from multiple sources.
Aims: Many of these coronal models may use a range of initial parameters that produce a large number of physically reasonable field configurations. How…
X-ray variability of HD 189733 across eight years of XMM-Newton observations
Micela, G.; Sciortino, S.; Pillitteri, I. +2 more
The characterization of exoplanets, their formation, evolution, and chemical changes is tightly linked to our knowledge of their host stars. In particular, stellar X-rays and UV emission have a strong impact on the dynamical and chemical evolution of planetary atmospheres. We analyzed 25 XMM-Newton observations encompassing about eight years and t…
The role of highly vibrationally excited H2 initiating the nitrogen chemistry. Quantum study and 3σ detection of NH emission in the Orion Bar PDR
Goicoechea, Javier R.; Roncero, Octavio
The formation of hydrides by gas-phase reactions between H2 and a heavy element atom is a very selective process. Reactions with ground-state neutral carbon, oxygen, nitrogen, and sulfur atoms are very endoergic and have high energy barriers because the H2 molecule has to be fragmented before a hydride bond is formed. In cold…
Measuring chemical abundances in AGN from infrared nebular lines: HII-CHI-MISTRY-IR for AGN
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +1 more
Context. Future and ongoing infrared and radio observatories such as JWST, METIS, and ALMA will increase the amount of rest-frame IR spectroscopic data for galaxies by several orders of magnitude. While studies of the chemical composition of the interstellar medium (ISM) based on optical observations have been widely spread over decades for star-f…