Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441108m&link_type=abstract
American Astronomical Society, AAS Meeting #214, #411.08; Bulletin of the American Astronomical Society, Vol. 41, p.676
Astronomy and Astrophysics
Astronomy
Scientific paper
The SIM Lite team plans to undertake several planet surveys. One of them, the Deep Planet Survey, is designed to detect Earth-mass exoplanets in the habitable zones of nearby main sequence stars. A double blind study has been conducted to assess the capability of SIM to detect such small planets in a multiplanet system where several giant planets might be present. Five independent teams of dynamics experts generated ensembles of hundreds of plausible planetary systems that might form around solar-type stars. A data simulation team generated realistic simulated astrometric and radial velocity measurement data sets for 60 stars chosen from the SIM target list, by perturbing each with a planetary system randomly drawn from the ensembles generated by the dynamics teams, and then adding instrument noise. Next, four independent analysis teams processed the simulated data sets, detecting and fitting the orbits and masses of the planets orbiting each of the 60 stars. Finally, the analysis teams submitted their consensus solution for each star, chosen after cross-comparison and discussion of the solutions, and before being allowed to see the true solutions. One of the tools which helped in the decision process was an orbit integrator using the publicly available HNBody code so that the orbit solutions could be analyzed in terms of temporal stability over many orbits. In this contribution, we will describe the implementation of this integrator and an analysis of the different blind test solutions. We will discuss also the usefulness of this method given that some planets might be not detected but still affect the overall stability of the system.
Catanrazite J.
Malbet Fabien
Shao Maxine
Zhai Cengxing
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