Search Publications
Observed seasonal changes in Martian hydrogen chloride explained by heterogeneous chemistry
Montmessin, Franck; Trokhimovskiy, Alexander; Korablev, Oleg +7 more
Aims: The aim of this work is to show that the seasonal changes and vertical distribution profiles of hydrogen chloride (HCl) on Mars, as observed by the ExoMars Trace Gas Orbiter, are consistent with the production of gas-phase chlorine atoms from airborne dust and a subsequent rapid uptake of HCl onto water ice particles.
Methods: A 1D…
Numerous bidirectionally propagating plasma blobs near the reconnection site of a solar eruption
Chen, Wei; Tian, Hui; Su, Yang +7 more
A current sheet is a common structure involved in solar eruptions. However, it is observed in a minority of the events, and the physical properties of its fine structures during a solar eruption are rarely investigated. Here, we report an on-disk observation that displays 108 compact, circular, or elliptic bright structures, presumably plasma blob…
Near-infrared spectroscopic characterisation of Gaia ultra-cool dwarf candidates. Spectral types and peculiarities
Sarro, L. M.; Reylé, C.; Cooper, W. J. +10 more
Context. The local census of very low-mass stars and brown dwarfs is crucial to improving our understanding of the stellar-substellar transition and their formation history. These objects, known as ultra-cool dwarfs (UCDs), are essential targets for searches of potentially habitable planets. However, their detection poses a challenge because of th…
PDRs4All. V. Modelling the dust evolution across the illuminated edge of the Orion Bar
Abergel, A.; Juvela, M.; Paladini, R. +31 more
Context. Interstellar dust particles, in particular carbonaceous nano-grains (like polycyclic aromatic hydrocarbons, fullerenes, and amorphous hydrogenated carbon), are critical players for the composition, energy budget, and dynamics of the interstellar medium (ISM). The dust properties, specifically the composition and size of dust grains are no…
Study of X-ray emission from the S147 nebula with SRG/eROSITA: X-ray imaging, spectral characterization, and a multiwavelength picture
Khabibullin, Ildar; Churazov, Eugene; Sasaki, Manami +11 more
Simeis 147 (S147, G180.0-01.7, "Spaghetti nebula") is a supernova remnant (SNR) extensively studied across the entire electromagnetic spectrum, from radio to giga-electronvolt γ-rays, except in X-rays. Here, we report the first detection of significant X-ray emission from the entire SNR using data of the extended ROentgen Survey Imaging Telescope …
Searching for low-mass companions at small separations in transition disks with aperture masking interferometry
Garufi, A.; Sitko, M. L.; Johnstone, D. +9 more
Context. Transition disks have large central cavities that have been resolved by imaging surveys during recent years. Cavities and other substructures in circumstellar disks are often interpreted as signposts to massive companions. Detecting companions at small angular separations is challenging with coronagraphic imaging observations.
Aims: …
Radiative and mechanical energies in galaxies. I. Contributions of molecular shocks and PDRs in 3C 326 N
Godard, B.; Guillard, P.; Pineau des Forêts, G. +1 more
Context. Atomic and molecular lines emitted from galaxies are fundamental tracers of the medium responsible for the emission and contain valuable information regarding the energy budget and the strength of the different feedback mechanisms.
Aims: The goal of this work is to provide a new framework for the interpretation of atomic and molecula…
The physical properties of T Pyx as measured by MUSE. I. The geometrical distribution of the ejecta and the distance to the remnant
Della Valle, M.; Pasquini, L.; Molaro, P. +8 more
Context. T Pyx is one of the most enigmatic recurrent novae, and it has been proposed as a potential Galactic type-Ia supernova progenitor.
Aims: Using spatially resolved data obtained with MUSE, we characterized the geometrical distribution of the material expelled in previous outbursts surrounding the white dwarf progenitor.
Methods: W…
The Baade-Wesselink projection factor of RR Lyrae stars. Calibration from OHP/SOPHIE spectroscopy and Gaia DR3 parallaxes
Mérand, Antoine; Breuval, Louise; Gieren, Wolfgang +10 more
Context. The application of the parallax-of-pulsation (PoP) technique to determine the distances of pulsating stars implies the use of a scaling parameter, namely the projection factor (p-factor), which is required to transform disc-integrated radial velocities (RVs) into photospheric expansion velocities. The value of this parameter is poorly kno…
A theoretical framework for BL Her stars. II. New period-luminosity relations in Gaia passbands
Marconi, Marcella; Ripepi, Vincenzo; Joyce, Meridith +6 more
Context. In the era of the Hubble tension, it is crucial to obtain a precise calibration of the period-luminosity (PL) relations of classical pulsators. Type II Cepheids (T2Cs; often exhibiting negligible or weak metallicity dependence on PL relations) used in combination with RR Lyraes and the tip of the red giant branch may prove useful as an al…