Search Publications
Spectro-photometric distances to stars: A general purpose Bayesian approach
Schneider, Donald P.; Steinmetz, Matthias; Girardi, Léo +16 more
Context. Determining distances to individual field stars is a necessary step towards mapping Galactic structure and determining spatial variations in the chemo-dynamical properties of stellar populations in the Milky Way.
Aims: In order to provide stellar distance estimates for various spectroscopic surveys, we have developed a code that esti…
A package for the automated classification of periodic variable stars
Bailer-Jones, Coryn A. L.; Kim, Dae-Won
We present a machine learning package for the classification of periodic variable stars. Our package is intended to be general: it can classify any single band optical light curve comprising at least a few tens of observations covering durations from weeks to years with arbitrary time sampling. We use light curves of periodic variable stars taken …
Parallax and masses of α Centauri revisited
Boffin, Henri M. J.; Pourbaix, Dimitri
Context. Despite the thorough work of van Leeuwen, the parallax of α Centauri is still far from being carved in stone. Any derivation of the individual masses is therefore uncertain, if not questionable. And yet, that does not prevent this system from being used for calibration purpose in several studies.
Aims: We aim for more accurate model-…
The SOPHIE search for northern extrasolar planets. IX. Populating the brown dwarf desert
Bouchy, F.; Deleuil, M.; Moutou, C. +20 more
Radial velocity planet search surveys of nearby solar-type stars have shown a strong scarcity of brown dwarf companions within ~5 AU. There is presently no comprehensive explanation for this lack of brown dwarf companions; therefore, increasing the sample of such objects is crucial to understand their formation and evolution. Based on precise radi…
Radial velocities of K-M dwarfs and local stellar kinematics
Sperauskas, J.; Bartašiūtė, S.; Deveikis, V. +3 more
Aims: The goal of this paper is to present complete radial-velocity data for the spectroscopically selected McCormick sample of nearby K-M dwarfs and, based on these and supplementary data, to determine the space-velocity distributions of late-type stars in the solar neighborhood.
Methods: We analyzed nearly 3300 measurements of radial v…
The SOPHIE search for northern extrasolar planets. XI. Three new companions and an orbit update: Giant planets in the habitable zone
Bouchy, F.; Deleuil, M.; Moutou, C. +25 more
We report the discovery of three new substellar companions to solar-type stars, HD 191806, HD 214823, and HD 221585, based on radial velocity measurements obtained at the Haute-Provence Observatory. Data from the SOPHIE spectrograph are combined with observations acquired with its predecessor, ELODIE, to detect and characterise the orbital paramet…
The SOPHIE search for northern extrasolar planets. VIII. Follow-up of ELODIE candidates: long-period brown-dwarf companions
Bouchy, F.; Moutou, C.; Queloz, D. +29 more
Long-period brown dwarf companions detected in radial velocity surveys are important targets for direct imaging and astrometry to calibrate the mass-luminosity relation of substellar objects. Through a 20-yr radial velocity monitoring of solar-type stars that began with ELODIE and was extended with SOPHIE spectrographs, giant exoplanets and brown …
Nine new open clusters within 500 pc from the Sun
Goldman, Bertrand; Röser, Siegfried; Schilbach, Elena
Aims: One of the results of the Milky Way Star Clusters (MWSC) survey was the detection of a slight under-density of old (ca. 1 Gyr) clusters within the nearest kilo-parsec from the Sun. This under-density may be due to an ineffectiveness in the detection of larger structures with lower surface brightness. We report on our attempts to reveal …
Magnetic field geometry of an unusual cometary cloud Gal 110-13
Neha, S.; Soam, A.; Maheswar, G. +2 more
Aims: We carried out optical polarimetry of an isolated cloud, Gal 110-13, to map the plane-of-the-sky magnetic field geometry. The main aim of the study is to understand the most plausible mechanism responsible for the unusual cometary shape of the cloud in the context of its magnetic field geometry.
Methods: When unpolarized starlight …
Overlooked wide companions of nearby F stars
Scholz, R. -D.
Aims: We checked a sample of 545 F stars within 50 pc for wide companions using existing near-infrared and optical sky surveys.
Methods: Applying the common proper motion (CPM) criterion, we detected wide companion candidates with 6-120 arcsec angular separations by visual inspection of multi-epoch finder charts and by searching in prope…