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We present a selection of results obtained with detailed simulations reproducing the process of data acquisition and analysis for the global astrometry satellite GAIA, a space mission concept currently under study by ESA as part of Horizon 2000 Plus program.Limits on distance for pure detection and significant orbital parameters estimation of Jupiter-mass and Jupiter-like planets around solar-type stars in the neighborhood of our sun are derived. 相似文献
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Mario Gai Alberto Vecchiato Sebastiano Ligori Alessandro Sozzetti Mario G. Lattanzi 《Experimental Astronomy》2012,34(2):165-180
The Gravitation Astrometric Measurement Experiment (GAME) is a mission concept based on astronomical techniques (astrometry and coronagraphy) for Fundamental Physics measurements, namely the ?? and ?? parameters of the Parametrized Post-Newtonian formulation of gravitation theories extending the General Relativity. The science case also addresses cosmology, extra-solar planets, Solar System objects and fundamental stellar parameters. The mission concept is described, including the measurement approach and the instrument design. 相似文献
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The scientific output of the proposed EChO mission (in terms of spectroscopic characterization of the atmospheres of transiting extrasolar planets) will be maximized by a careful selection of targets and by a detailed characterization of the main physical parameters (such as masses and radii) of both the planets and their stellar hosts. To achieve this aim, the availability of high-quality data from other space-borne and ground-based programs will play a crucial role. Here we identify and discuss the elements of the Gaia catalogue that will be of utmost relevance for the selection and characterization of transiting planet systems to be observed by the proposed EChO mission. 相似文献
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H. Lammer A. Hanslmeier J. Schneider I. K. Stateva M. Barthelemy A. Belu D. Bisikalo M. Bonavita V. Eybl V. Coudé du Foresto M. Fridlund R. Dvorak S. Eggl J. -M. Grießmeier M. Güdel E. Günther W. Hausleitner M. Holmström E. Kallio M. L. Khodachenko A. A. Konovalenko S. Krauss L. V. Ksanfomality Yu. N. Kulikov K. Kyslyakova M. Leitzinger R. Liseau E. Lohinger P. Odert E. Palle A. Reiners I. Ribas H. O. Rucker N. Sarda J. Seckbach V. I. Shematovich A. Sozzetti A. Tavrov M. Xiang-Grüß 《Solar System Research》2010,44(4):290-310
After the discovery of more than 400 planets beyond our Solar System, the characterization of exoplanets as well as their host stars can be considered as one of the fastest growing fields in space science during the past decade. The characterization of exoplanets can only be carried out in a well coordinated interdisciplinary way which connects planetary science, solar/stellar physics and astrophysics. We present a status report on the characterization of exoplanets and their host stars by reviewing the relevant space- and ground-based projects. One finds that the previous strategy changed from space mission concepts which were designed to search, find and characterize Earth-like rocky exoplanets to: A statistical study of planetary objects in order to get information about their abundance, an identification of potential target and finally its analysis. Spectral analysis of exoplanets is mandatory, particularly to identify bio-signatures on Earth-like planets. Direct characterization of exoplanets should be done by spectroscopy, both in the visible and in the infrared spectral range. The way leading to the direct detection and characterization of exoplanets is then paved by several questions, either concerning the pre-required science or the associated observational strategy. 相似文献
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M. G. Lattanzi A. Spagna A. Sozzetti S. Casertano † 《Monthly notices of the Royal Astronomical Society》2000,317(1):211-224
The proposed global astrometry mission GAIA , recently recommended within the context of ESA's Horizon 2000 Plus long-term scientific programme, appears capable of surveying the solar neighbourhood within ∼200 pc for the astrometric signatures of planets around stars down to the magnitude limit of V =17 mag, which includes late M dwarfs at 100 pc.
Realistic end-to-end simulations of the GAIA global astrometric measurements have yielded the first quantitative estimates of the sensitivity to planetary perturbations and of the ability to measure their orbital parameters. Single Jupiter-mass planets around normal solar-type stars appear detectable out to 150 pc ( V ≤12 mag) with probabilities ≥50 per cent for orbital periods between ∼2.5 and ∼8 yr, and their orbital parameters are measurable with better than 30 per cent accuracy to about 100 pc. Jupiter-like objects (same mass and period as our giant planet) are found with similar probabilities out to 100 pc.
These first experiments indicate that the GAIA results would constitute an important addition to those that will come from the other ongoing and planned planet-search programmes. These data combined would provide a formidable testing ground on which to confront theories of planetary formation and evolution. 相似文献
Realistic end-to-end simulations of the GAIA global astrometric measurements have yielded the first quantitative estimates of the sensitivity to planetary perturbations and of the ability to measure their orbital parameters. Single Jupiter-mass planets around normal solar-type stars appear detectable out to 150 pc ( V ≤12 mag) with probabilities ≥50 per cent for orbital periods between ∼2.5 and ∼8 yr, and their orbital parameters are measurable with better than 30 per cent accuracy to about 100 pc. Jupiter-like objects (same mass and period as our giant planet) are found with similar probabilities out to 100 pc.
These first experiments indicate that the GAIA results would constitute an important addition to those that will come from the other ongoing and planned planet-search programmes. These data combined would provide a formidable testing ground on which to confront theories of planetary formation and evolution. 相似文献
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