Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-24
Astronomy and Astrophysics
Astrophysics
4 pages, 2 pictures, accepted for publication in A&A Letters
Scientific paper
10.1051/0004-6361:20010788
We use detailed numerical simulations and the $\upsilon$ Andromedae, planetary 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 $\upsilon$ Andromedae, system, 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.
Casertano Sefano
Lattanzi Mario G.
Sozzetti Alessandro
Spagna Alessandro
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