Search Publications
Learning mid-IR emission spectra of polycyclic aromatic hydrocarbon populations from observations
Joblin, C.; Berné, O.; Foschino, S.
Context. The James Webb Space Telescope (JWST) will deliver an unprecedented quantity of high-quality spectral data over the 0.6-28 µm range. It will combine sensitivity, spectral resolution, and spatial resolution. Specific tools are required to provide efficient scientific analysis of such large data sets.
Aims: Our aim is to illustra…
HADES RV Programme with HARPS-N at TNG. X. The non-saturated regime of the stellar activity-rotation relationship for M dwarfs
Rebolo, R.; Ribas, I.; Scandariato, G. +22 more
Aims: We extend the relationship between X-ray luminosity (Lx) and rotation period (Prot) found for main-sequence FGK stars, and test whether it also holds for early M dwarfs, especially in the non-saturated regime (Lx ∝ Prot-2) which corresponds to slow rotators.
Methods: We use the…
Stars and brown dwarfs in the σ Orionis cluster. IV. IDS/INT and OSIRIS/GTC spectroscopy and Gaia DR2 astrometry
Alonso-Floriano, F. J.; Caballero, J. A.; Montes, D. +3 more
Context. Only a few open clusters are as important for the study of stellar and substellar objects, and their formation and evolution, as the young σ Orionis cluster. However, a complete spectroscopic characterisation of its whole stellar population is still missing.
Aims: We filled most of that gap with a large spectroscopic and astrometric …
Effect of radiative heat transfer in porous comet nuclei: case study of 67P/Churyumov-Gerasimenko
Shi, Xian; Blum, Jürgen; Gundlach, Bastian +2 more
Context. Radiative heat transfer occurs in a porous medium, such as regolith on planetary bodies. Radiation enhances the efficiency of heat transport through the subsurface, effecting a strong temperature dependence of thermal conductivity. However, this effect has been omitted in many studies of comet 67P/Churyumov-Gerasimenko (67P).
Aims: W…
Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae
Monnier, John D.; Kraus, Stefan; Baron, Fabien +11 more
Context. T Tauri stars are low-mass young stars whose disks provide the setting for planet formation. Despite this, their structure is poorly understood. We present new infrared interferometric observations of the SU Aurigae circumstellar environment that offer resolution that is three times higher and a better baseline position angle coverage tha…
Carbonaceous nano-dust emission in proto-planetary discs: the aliphatic-aromatic components
Ysard, N.; Dartois, E.; Habart, E. +3 more
Context. In the interstellar medium, carbon (nano-)grains are a major component of interstellar dust. This solid phase is more vulnerable to processing and destruction than its silicate counterpart. It exhibits a complex, size-dependent evolution that is due to interactions within different radiative and dynamical environments. Infrared signatures…
Global mapping of lunar refractory elements: multivariate regression vs. machine learning
Wöhler, C.; Grumpe, A.; Bhatt, M. +2 more
Context. The quantitative estimation of elemental concentrations at the spatial resolution of hyperspectral near-infrared (NIR) images of the lunar surface is an important tool for understanding the processes relevant for the origin and evolution of the Moon.
Aims: We aim to map the abundances of the elements Fe, Ca, and Mg at a typical accur…
Hinode EIS line widths in the quiet corona up to 1.5 R⊙
Mason, H. E.; Del Zanna, G.; Gupta, G. R.
We present an analysis of several Hinode Extreme-ultraviolet Imaging Spectrometer (EIS) observations of coronal line widths in the quiet Sun, up to 1.5 R⊙ radial distances. Significant variations are found, which indicates no damping of Alfvén waves in the quiescent corona. However, the uncertainties in estimating the instrumental width…
Consistent radial velocities of classical Cepheids from the cross-correlation technique
Kervella, P.; Anderson, R. I.; Trahin, B. +11 more
Context. Accurate radial velocities (vrad) of Cepheids are mandatory within the context of Cepheid distance measurements using the Baade-Wesselink technique. The most common vrad derivation method consists in cross-correlating the observed stellar spectra with a binary template and measuring a velocity on the resulting mean p…
Combined asteroseismology, spectroscopy, and astrometry of the CoRoT B2V target HD 170580
Poretti, E.; Rainer, M.; Aerts, C. +9 more
Context. Space asteroseismology reveals that stellar structure and evolution models of intermediate- and high-mass stars are in need of improvement in terms of angular momentum and chemical element transport.
Aims: We aim to probe the interior structure of a hot, massive star in the core-hydrogen-burning phase of its evolution.
Methods: …