Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dda....36.0703l&link_type=abstract
American Astronomical Society, DDA meeting #36, #07.03; Bulletin of the American Astronomical Society, Vol. 37, p.526
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of the HD 82943 planetary system based on a radial velocity data set that combines new measurements obtained with the Keck telescope and the published CORALIE measurements. We examine simultaneously the goodness of fit and the dynamical properties of the best-fit double-Keplerian model as a function of the poorly constrained eccentricity and argument of periapse of the outer planet's orbit. The fit with the minimum χν 2 is dynamically unstable if the orbits are assumed to be coplanar. However, the minimum is relatively shallow, and there is a wide range of fits outside the minimum with reasonable χν 2. For an assumed coplanar inclination i = 30o (sin i = 0.5), only the good fits with both of the lowest order, eccentricity-type mean-motion resonance variables at the 2:1 commensurability, θ 1 and θ 2, librating about 0o are stable. For sin i = 1, there are also some good fits with only θ 1 librating that are stable for at least 107 years. The libration semiamplitudes are about 6o for θ 1 and 10o for θ 2 for the stable good fit with the smallest libration amplitudes of both θ 1 and θ 2. We do not find any good fits that are non-resonant and stable. Thus the two planets in the HD 82943 system are almost certainly in 2:1 mean-motion resonance, with at least θ 1 librating, and the observations may even be consistent with small-amplitude librations of both θ 1 and θ 2.
Butler Paul R.
Fischer Debra Ann
Lee Michael H.
Marcy Geo? W.
Vogt Stefan
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