Search Publications
Curiouser and curiouser: the peculiar chemical composition of the Li- and Na-rich star in ω Centauri
Salaris, M.; Bonifacio, P.; Momany, Y. +5 more
We present a multi-instrument spectroscopic analysis of the unique Li- and Na-rich giant star #25664 in ω Centauri, using spectra acquired with FLAMES-GIRAFFE, X-shooter, UVES, and HARPS. Li and Na abundances have been derived from the UVES spectrum using transitions weakly sensitive to non-local thermodynamic equilibrium and assumed isotopic rati…
High-cadence measurements of electron pitch-angle distributions from Solar Orbiter SWA-EAS burst mode operations
Lewis, G. R.; Kataria, D. O.; Livi, S. +17 more
Small-scale kinetic processes associated with turbulence, plasma instabilities, magnetic reconnection, etc., play a major role in dissipating energy and governing the large-scale evolution of the solar wind. However, a general impediment to improving the understanding of the kinetic physics of the solar wind is in the limitations on measurement ca…
Physical characterization of S169: a prototypical IR bubble associated with the massive star-forming region IRAS 12326-6245
Reynoso, E. M.; Cichowolski, S.; Bronfman, L. +5 more
Aims: With the aim of studying the physical properties of Galactic IR bubbles and to explore their impact in massive star formation, we present a study of the IR bubble S169, associated with the massive star forming region IRAS 12326-6245.
Methods: We used CO (2-1),13CO (2-1), C18O (2-1), HCN (3-2), and HCO+
Bayesian decomposition of the Galactic multi-frequency sky using probabilistic autoencoders
Enßlin, Torsten A.; Frank, Philipp; Müller, Ancla +2 more
Context. All-sky observations show both Galactic and non-Galactic diffuse emission, for example from interstellar matter or the cosmic microwave background (CMB). The decomposition of the emission into different underlying radiative components is an important signal reconstruction problem.
Aims: We aim to reconstruct radiative all-sky compone…
Debris discs in binaries: morphology and photometric signatures
Kral, Q.; Olofsson, J.; Thebault, P.
Context. Since about half of all main-sequence stars reside in multiple star systems, it is important to consider the effect of binarity on the evolution of planetesimal belts in these complex systems.
Aims: We aim to see whether debris belts evolving between two stars may be impacted by the presence of the companion and whether this leaves a…
Redshift identification of X-ray-selected active galactic nuclei in the J1030 field: searching for large-scale structures and high-redshift sources
Prandoni, I.; Bolzonella, M.; Vignali, C. +23 more
We publicly release the spectroscopic and photometric redshift catalog of the sources detected with Chandra in the field of the z = 6.3 quasar SDSS J1030+0525. This is currently the fifth-deepest extragalactic X-ray field, and reaches a 0.5-2 keV flux limit of f0.5 − 2 = 6 × 10−17 erg s−1 cm−2. Using two…
Multi-band observations of Swift J0840.7−3516: A new transient ultra-compact X-ray binary candidate
Campana, S.; Rea, N.; Esposito, P. +5 more
We report on multi-band observations of the transient source Swift J0840.7−3516, which was detected in outburst in 2020 February by the Neil Gehrels Swift Observatory. The outburst episode lasted just ∼5 days, during which the X-ray luminosity quickly decreased from LX ≈ 3 × 1037 d102 erg s−1 …
The thermal emission of Saturn's icy moons. Effects of topography and regolith properties
Lucas, A.; Ferrari, C.; Jacquemoud, S.
Context. The effects of space weathering and other alteration processes on the upper surface of Saturn's icy moons are yet to be explored.
Aims: We present a thermophysical model parametrised by way of regolith properties such as porosity, grain size, and composition, as well as the local topography. The modelled surface temperature and appar…
Collisional effects in the blue wing of Lyman-α
Kielkopf, J. F.; Allard, N. F.; Spiegelman, F.
Spectral observations below Lyman-α are now obtained with the Cosmic Origin Spectrograph (COS) on the Hubble Space Telescope. It is therefore necessary to provide an accurate treatment of the blue wing of the Lyman-α line that enables correct calculations of radiative transport in DA and DBA white dwarf stars. On the theoretical front, we very rec…
Effects of anisotropy on absorption cross-section spectra of medium-sized spheroidal corundum particles
Mutschke, H.; Höfer, S.; Mayerhöfer, Th. G.
Context. It has been widely accepted that corundum particles condense in the atmospheres of oxygen-rich asymptotic giant branch stars and effectively produce an infrared emission feature at 13 µm. Laboratory experiments have predicted that these particles have the shape of oblate spheroids.
Aims: We investigate the influence of the mate…