Search Publications
The Gaia-ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates
Hatzidimitriou, D.; Gilmore, G.; Bayo, A. +35 more
Context. The Gaia-ESO Survey (GES) is a large spectroscopic survey that provides a unique opportunity to study the distribution of spectroscopic multiple systems among different populations of the Galaxy.
Aims: Our aim is to detect binarity/multiplicity for stars targeted by the GES from the analysis of the cross-correlation functions (CCFs) …
High-precision abundances of elements in Kepler LEGACY stars. Verification of trends with stellar age
Christensen-Dalsgaard, J.; Grundahl, F.; Slumstrup, D. +3 more
Context. A previous study of solar twin stars has revealed the existence of correlations between some abundance ratios and stellar age providing new knowledge about nucleosynthesis and Galactic chemical evolution.
Aims: High-precision abundances of elements are determined for stars with asteroseismic ages in order to test the solar twin relat…
Dual Maxwellian-Kappa modeling of the solar wind electrons: new clues on the temperature of Kappa populations
Fichtner, H.; Pierrard, V.; Lazar, M. +2 more
Context. Recent studies on Kappa distribution functions invoked in space plasma applications have emphasized two alternative approaches that may assume the temperature parameter either dependent or independent of the power-index κ. Each of them can obtain justification in different scenarios involving Kappa-distributed plasmas, but direct evidence…
The Gaia-ESO Survey: Calibration strategy
Gilmore, G.; Bayo, A.; Allende Prieto, C. +60 more
The Gaia-ESO survey (GES) is now in its fifth and last year of observations and has produced tens of thousands of high-quality spectra of stars in all Milky Way components. This paper presents the strategy behind the selection of astrophysical calibration targets, ensuring that all GES results on radial velocities, atmospheric parameters, and chem…
Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
André, Ph.; Könyves, V.; Fedele, D. +22 more
Context. Herschel observations of water and highly excited CO (J > 9) have allowed the physical and chemical conditions in the more active parts of protostellar outflows to be quantified in detail for the first time. However, to date, the studied samples of Class 0/I protostars in nearby star-forming regions have been selected from bright, well…
Kinematics of the local disk from the RAVE survey and the Gaia first data release
Robin, Annie C.; Bienaymé, Olivier; Fernández-Trincado, José G. +1 more
Aims: We attempt to constrain the kinematics of the thin and thick disks using the Besançon population synthesis model together with RAVE DR4 and Gaia first data release (TGAS).
Methods: The RAVE fields were simulated by applying a detailed target selection function and the kinematics was computed using velocity ellipsoids depending on a…
K2-106, a system containing a metal-rich planet and a planet of lower density
Deeg, H.; Erikson, A.; Fridlund, M. +43 more
Aims: Planets in the mass range from 2 to 15 M⊕ are very diverse. Some of them have low densities, while others are very dense. By measuring the masses and radii, the mean densities, structure, and composition of the planets are constrained. These parameters also give us important information about their formation and evolution, an…
The formation of the Milky Way halo and its dwarf satellites; a NLTE-1D abundance analysis. I. Homogeneous set of atmospheric parameters
Jablonka, P.; North, P.; Sitnova, T. +2 more
We present a homogeneous set of accurate atmospheric parameters for a complete sample of very and extremely metal-poor stars in the dwarf spheroidal galaxies (dSphs) Sculptor, Ursa Minor, Sextans, Fornax, Boötes I, Ursa Major II, and Leo IV. We also deliver a Milky Way (MW) comparison sample of giant stars covering the - 4 < [Fe/H] < - 1.7 m…
Hot gas around SN 1998bw: Inferring the progenitor from its environment
Galbany, L.; Schady, P.; Krühler, T. +3 more
Spatially resolved spectroscopy of the environments of explosive transients carries detailed information about the physical properties of the stellar population that gave rise to the explosion, and thus the progenitor itself. Here, we present new observations of ESO184-G82, the galaxy hosting the archetype of the γ-ray burst/supernova connection, …
2WHSP: A multi-frequency selected catalogue of high energy and very high energy γ-ray blazars and blazar candidates
Giommi, P.; Padovani, P.; Chang, Y. -L. +1 more
Aims: High synchrotron peaked blazars (HSPs) dominate the γ-ray sky at energies higher than a few GeV; however, only a few hundred blazars of this type have been cataloged so far. In this paper we present the 2WHSP sample, the largest and most complete list of HSP blazars available to date, which is an expansion of the 1WHSP catalogue of γ-ra…