Search Publications
Astrometric detection of giant planets around nearby M dwarfs: the Gaia potential
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +3 more
Cool M dwarfs within a few tens of parsecs from the Sun are becoming the focus of dedicated observational programs in the realm of exoplanet astrophysics. Gaia, in its all-sky survey of >109 objects, will deliver precision astrometry for a magnitude-limited (V = 20) sample of M dwarfs. We investigate some aspects of the synergy betwe…
Reproducing properties of MW dSphs as descendants of DM-free TDGs
Kroupa, Pavel; Hammer, François; Puech, Mathieu +4 more
The Milky Way (MW) dwarf spheroidal (dSph) satellites are known to be the most dark-matter (DM) dominated galaxies with estimates of dark-to-baryonic matter reaching even above 100. It comes from the assumption that dwarfs are dynamically supported by their observed velocity dispersions. However, their spatial distributions around the MW are not a…
M2M modelling of the Galactic disc via PRIMAL: fitting to Gaia error added data
Kawata, Daisuke; Hunt, Jason A. S.
We have adapted our made-to-measure (M2M) algorithm PRIMAL to use mock Milky Way like data constructed from an N-body barred galaxy with a boxy bulge in a known dark matter potential. We use M0 giant stars as tracers, with the expected error of the ESA (European Space Agency) space astrometry mission Gaia. We demonstrate the process of constructin…
Characterizing the Galactic warp with Gaia - I. The tilted ring model with a twist
Figueras, Francesca; Mateu, Cecilia; Romero-Gómez, Mercè +2 more
We explore the possibility of detecting and characterizing the warp of the stellar disc of our Galaxy using synthetic Gaia data. The availability of proper motions and, for the brightest stars radial velocities, adds a new dimension to this study. A family of Great Circle Cell Counts methods is used. They are ideally suited to find the tilt and tw…
GS-TEC: the Gaia spectrophotometry transient events classifier
Wyrzykowski, Łukasz; Blagorodnova, Nadejda; Irwin, Mike +2 more
We present an algorithm for classifying the nearby transient objects detected by the Gaia satellite. The algorithm will use the low-resolution spectra from the blue and red spectrophotometers on board the satellite. Taking a Bayesian approach, we model the spectra using the newly constructed reference spectral library and literature-driven priors.…
Masses of the components of SB2 binaries observed with Gaia - I. Selection of the sample and mass ratios of 20 new SB2s discovered with Sophie
Mazeh, T.; Tal-Or, L.; Halbwachs, J. -L. +7 more
In anticipation of the Gaia astrometric mission, a large sample of spectroscopic binaries has been observed since 2010 with the Sophie spectrograph at the Haute-Provence Observatory. Our aim is to derive the orbital elements of double-lined spectroscopic binaries (SB2s) with an accuracy sufficient finally to obtain the masses of the components wit…
Weighted statistical parameters for irregularly sampled time series
Rimoldini, Lorenzo
Unevenly spaced time series are common in astronomy because of the day-night cycle, weather conditions, dependence on the source position in the sky, allocated telescope time and corrupt measurements, for example, or inherent to the scanning law of satellites like Hipparcos and the forthcoming Gaia. Irregular sampling often causes clumps of measur…
Predictions for the detection of Earth and Mars Trojan asteroids by the Gaia satellite
Tanga, P.; Coward, D. M.; Todd, M. +1 more
The European Space Agency Gaia satellite, planned for launch in late 2013, will perform systematic astrometric observations of the whole sky over a five year period. During this mission, many thousands of Solar System objects down to magnitude V = 20 will be observed including near-Earth asteroids and objects at solar elongations as low as 45°, wh…