Detecting and Measuring Interacting Exoplanetary Systems with SIM Lite

Details Detecting and Measuring Interacting Exoplanetary Systems with SIM Lite Detecting and Measuring Interacting Exoplanetary Systems with SIM Lite

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430609f&link_type=abstract

American Astronomical Society, AAS Meeting #214, #306.09; Bulletin of the American Astronomical Society, Vol. 41, p.730

Statistics

Methodology

Scientific paper

Of the approximately 300 known extrasolar planetary systems, 30 are known to harbor multiple planets. Further, analysis of residuals for systems with long-term radial velocity (RV) observations suggests that over 30% of systems with one known planet harbor at least one additional giant planet with a longer orbital period, and this frequency may rise as sensitivity to lower mass planets improves. About a third of the known multiple systems appear to have planets in or near low-order mean-motion resonances (MMRs); the dynamics of such systems can help constrain models of planet migration. Most current exoplanet data analysis methodology relies on Keplerian orbit models for planet detection and measurement. However, the motions of interacting planets are not precisely Keplerian, raising questions about the suitability and sensitivity of current methods for studying interacting systems. We investigate the ability of Keplerian orbit models to detect and accurately measure interacting planets in astrometry data expected from SIM Lite, supplemented by long-term RV data, including planets with 2:1 MMRs. We will present initial results for our analyses of interacting multiple planet systems.

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