Volume 373, Number 3, July III 2001
|Page(s)||L21 - L24|
|Published online||15 July 2001|
Detection and measurement of planetary systems with GAIA
The University of Pittsburgh, Department of Physics and Astronomy, Pittsburgh, PA 15260, USA
2 Osservatorio Astronomico di Torino, 10025 Pino Torinese, Italy
3 Space Telescope Science Institute, Baltimore, MD 21218, USA
Corresponding author: A. Sozzetti, firstname.lastname@example.org
Accepted: 27 April 2001
We use detailed numerical simulations and the υ Andromedæplanetary system as a template to evaluate the capability of the ESA Cornerstone Mission GAIA in detecting and measuring multiple planets around solar-type stars in the neighborhood of the Solar System. For the outer two planets of the υ Andromedæsystem, GAIA high-precision global astrometric measurements would provide estimates of the full set of orbital elements and masses accurate to better than 1-10% , and would be capable of addressing the coplanarity issue by determining the true geometry of the system with uncertainties of order of a few degrees. Finally, we discuss the generalization to a variety of configurations of potential planetary systems in the solar neighborhood for which GAIA could provide accurate measurements of unique value for the science of extra-solar planets.
Key words: astrometry / stars: individual (υ Andromedæ) / planetary systems / space vehicles / methods: data analysis
© ESO, 2001
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