Search Publications
Radiative losses in the chromosphere during a C-class flare
Leenaarts, J.; de la Cruz Rodríguez, J.; Díaz Baso, C. J. +2 more
Context. Solar flares release an enormous amount of energy (∼1032 erg) into the corona. A substantial fraction of this energy is transported to the lower atmosphere, which results in chromospheric heating. The mechanisms that transport energy to the lower solar atmosphere during a flare are still not fully understood.
Aims: We aim …
MUSE spectroscopic observations of the young massive cluster NGC 1850
Bragaglia, A.; D'Orazi, V.; Carretta, E. +4 more
Context. The double cluster NGC 1850 in the Large Magellanic Cloud is the nearest young massive cluster of the Local Group with a mass similar to those of Galactic globular clusters. Recent studies have revealed an extended morphology of its main-sequence turn-off (MSTO), which can be interpreted as a spread in either age or internal rotation. In …
The miniJPAS Survey: Detection of the double-core Lyα morphology for two high-redshift QSOs
Diego, J. M.; Hernán-Caballero, A.; Mendes de Oliveira, C. +30 more
Context. The Lyα emission is an important tracer of neutral gas in a circum-galactic medium (CGM) around high-z quasi-stellar objects (QSOs). The origin of Lyα emission around QSOs is still under debate, bringing on significant implications for galaxy formation and evolution.
Aims: In this paper, we study Lyα nebulae around two high redshift …
X-ray spectral-timing variability of 1A 0535+262 during the 2020 giant outburst
Zhang, S.; Reig, P.; Ma, R. C. +3 more
Context. The Be/X-ray binary 1A 0535+262 underwent a giant X-ray outburst in November 2020, peaking at ∼1 × 1038 erg s−1 (1-100 keV, 1.8 kpc), the brightest outburst recorded for this source so far. The source was monitored over two orders of magnitude in luminosity with Insight-HXMT, which allowed us to probe the X-ray varia…
Fitting XMM-Newton observations of the AXP 1RXS J170849.0−400910 with four magnetar surface emission models, and predictions for X-ray polarization observations with IXPE
Mereghetti, Sandro; Turolla, Roberto; Rigoselli, Michela +2 more
Context. Phase-resolved spectral and spectropolarimetric X-ray observations of magnetars present us with the opportunity to test models of the origin of the X-ray emission from these objects, and to constrain the properties of the neutron star surface and atmosphere.
Aims: Our first aim is to use archival XMM-Newton observations of the magnet…
Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +26 more
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass objects becomes essential in constraining their fundamental properties, as dynamical masses can be extracted from their Keplerian motion. Here, we present the combined e…
Perturbed distribution functions with accurate action estimates for the Galactic disc
Monari, G.; Ramos, P.; Siebert, A. +8 more
In the Gaia era, understanding the effects of the perturbations of the Galactic disc is of major importance in the context of dynamical modelling. In this theoretical paper we extend previous work in which, making use of the epicyclic approximation, the linearized Boltzmann equation had been used to explicitly compute, away from resonances, the pe…
Analysis of four solar occultations by Titan's atmosphere with the infrared channel of the VIMS instrument: Haze, CH4, CH3D, and CO vertical profiles
Rannou, P.; Vinatier, S.; Coutelier, M. +1 more
Titan, the largest satellite of Saturn, has a dense atmosphere mainly composed of nitrogen, methane at a percent level, and minor species. It is also covered by a thick and global photochemical organic haze. In the last two decades, the observations made by the Cassini orbiter and the Huygens probe have greatly improved our knowledge of Titan's sy…
Testing the accretion scenario of λ Boo stars
Angeloni, R.; Jaque Arancibia, M.; Veramendi, M. E. +5 more
Context. The existence of a group of λ Boo stars has been known for years, however, the origin of its chemical peculiarity is still a matter of debate.
Aims: Our aim is to test the accretion scenario of λ Boo stars. This model predicts that in a binary system with two early-type stars passing through a diffuse cloud, both stars ought to displ…
Absolute dimensions and apsidal motion of the eclipsing binaries V889 Aquilae and V402 Lacertae
Granzer, T.; Ribas, I.; Morales, J. C. +6 more
Context. Double-lined eclipsing binaries allow the direct determination of masses and radii, which are key for testing stellar models. With the launch of the TESS mission, many well-known eclipsing binaries have been observed at higher photometric precision, permitting the improvement of the absolute dimension determinations.
Aims: Using TESS…