Search Publications
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…
Detailed analysis of a sample of field metal-poor N-rich dwarfs
Bonifacio, P.; Caffau, E.; Spite, M. +2 more
Aims: The aim of this work is to compare the detailed chemical composition of the field N-rich dwarf stars to the second-generation stars of globular clusters (GCs) in order to investigate the hypothesis that they originated in GCs.
Methods: We measured the abundance of 23 elements (from Li to Eu) in a sample of six metal-poor N-rich star…
Stellar population astrophysics (SPA) with the TNG. The chemical content of the red supergiant population in the Perseus complex
Dalessandro, E.; Sanna, N.; Mucciarelli, A. +3 more
Context. The Perseus complex in the outer disk of the Galaxy hosts a number of clusters and associations of young stars. Gaia is providing a detailed characterization of their kinematic structure and evolutionary properties.
Aims: Within the SPA Large Program at the TNG, we secured HARPS-N and GIANO-B high-resolution optical and near-infrared…
Retrieving the transmission spectrum of HD 209458b using CHOCOLATE: a new chromatic Doppler tomography technique
Rebolo, R.; Pallé, E.; Zapatero Osorio, M. R. +29 more
Multiband photometric transit observations or low-resolution spectroscopy (spectro-photometry) are normally used to retrieve the broadband transmission spectra of transiting exoplanets in order to assess the chemical composition of their atmospheres. In this paper we present an alternative approach for recovering the broadband transmission spectra…
The effect of viewing angle on the Kennicutt-Schmidt relation of the local molecular clouds
Kainulainen, J.; Rezaei, Kh. S.; Spilker, A. +1 more
The Gaia data give us an unprecedented view to the three-dimensional (3D) structure of molecular clouds in the solar neighbourhood. We study how the projected areas and masses of clouds, and consequently the Kennicutt-Schmidt (KS) relation, depend on the viewing angle. We derive the probability distributions of the projected areas and masses for n…
Water emission tracing active star formation from the Milky Way to high-z galaxies
Kristensen, L. E.; Dutkowska, K. M.
Context. The question of how most stars in the Universe form remains open. While star formation predominantly takes place in young massive clusters, the current framework focuses on isolated star formation. This poses a problem when trying to constrain the initial stellar mass and the core mass functions, both in the local and distant Universe.
Broad-band analysis of X-ray pulsar 2S 1845-024
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more
We present the results of a detailed investigation of the poorly studied X-ray pulsar 2S 1845−024 based on data obtained at the NuSTAR observatory during the type I outburst in 2017. Neither pulse phase-averaged nor phase-resolved spectra of the source show evidence for a cyclotron absorption feature. We also used data obtained from other X-ray ob…