Short-Term Dynamical Interactions Among Extrasolar Planets

Details Short-Term Dynamical Interactions Among Extrasolar Planets Short-Term Dynamical Interactions Among Extrasolar Planets

2001-01-23

arxiv.org/abs/astro-ph/0101423v2

Astronomy and Astrophysics

Astrophysics

13 pages, including 4 figures and 3 tables Accepted by Astrophyiscal Journal Letters

Scientific paper

10.1086/319847

We show that short-term perturbations among massive planets in multiple planet systems can result in radial velocity variations of the central star which differ substantially from velocity variations derived assuming the planets are executing independent Keplerian motions. We discuss two alternate fitting methods which can lead to an improved dynamical description of multiple planet systems. In the first method, the osculating orbital elements are determined via a Levenberg-Marquardt minimization scheme driving an N-body integrator. The second method is an improved analytic model in which orbital elements are allowed to vary according to a simple model for resonant interactions between the planets. Both of these methods can determine the true masses for the planets by eliminating the sin(i) degeneracy inherent in fits that assume independent Keplerian motions. We apply our fitting methods to the GJ876 radial velocity data (Marcy et al. 2001), and argue that the mass factors for the two planets are likely in the 1.25-2.0 range

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