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Planets Beyond the Solar System and the Next Generation of Space Missions

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Sensitivity of a Global Search for Planets
in Space-Based Astrometric Databases

M. G. Lattanzi, A. Spagna, A. Sozzetti
Osservatorio Astronomico di Torino, Italy

Stefano Casertano
Space Telescope Science Institute, Baltimore MD

 Space-based astrometric missions, such as Hipparcos and the proposed GAIA and SIM missions, can yield frequently sampled, accurate position measurements for a large number of stars with uniform accuracy. Using Monte Carlo simulations, we assess the probability of identifying planets around nearby stars in such databases. The simulations are realistic and include effects such as a non-circular, randomly oriented planetary orbits, parallax and proper motion for the parent star, a Hipparcos-like scanning law and a finite mission length. The probability of false detections is also assessed. We give a simple parametrization of the discovery probability, based on the ratio of the astrometric signature to the accuracy of individual astrometric measurements.

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Dave Soderblom, soderblom@stsci.edu
Copyright © 1996, Association of Universities for Research in Astronomy. All rights reserved.

Last update: 10/22/96 11:00:29