Search Publications
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…
A photometric in-depth look at the core-collapsed globular cluster NGC 6284
Cadelano, Mario; Pallanca, Cristina; Dalessandro, Emanuele +4 more
High-resolution Hubble Space Telescope (HST) optical observations have been used to perform the deepest photometric study of the poorly studied Galactic globular cluster NGC 6284. The deep colour-magnitude diagram (CMD) that we obtained reaches 6 mag below the main-sequence turnoff. We provide the first determination of the gravitational centre (C…
Investigating the long secondary period phenomenon with the ASAS-SN and Gaia data
Pawlak, Michał; Mowlavi, Nami; Eyer, Laurent +1 more
Aims: The aim of this work is to create a complete list of sources exhibiting a long secondary period (LSP) in the ASAS-SN catalog of variable stars, and analyze the properties of this sample compared to other long period variables without an LSP.
Methods: We used the period-amplitude diagram to identify the 55 572 stars showing an LSP, …