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Issue A&A
Volume 373, Number 3, July III 2001
Page(s) L21 - L24
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010788



A&A 373, L21-L24 (2001)
DOI: 10.1051/0004-6361:20010788

Detection and measurement of planetary systems with GAIA

A. Sozzetti1, 2, S. Casertano3, M. G. Lattanzi2 and A. Spagna2

1  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

(Received 8 January 2001 / Accepted 27 April 2001 )

Abstract
We use detailed numerical simulations and the $\upsilon$ 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 $\upsilon$ 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 ($\upsilon$ Andromedæ) -- planetary systems -- space vehicles -- methods: data analysis

Offprint request: A. Sozzetti, alex@phyast.pitt.edu

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