Orbital Dynamics Of A Possible Second Planet In HD 17156

Details Orbital Dynamics Of A Possible Second Planet In HD 17156 Orbital Dynamics Of A Possible Second Planet In HD 17156

2008-03-20

arxiv.org/abs/0803.2935v2

Astronomy and Astrophysics

Astrophysics

Submitted to ApJ Letters, 4 pages, 5 figures

Scientific paper

In this letter we report the possible existence of a second planet in the transiting extrasolar planet system HD 17156 and its interactive dynamics with the previously known planet. The analysis is achieved through the \POFP\ optimization software which is based on a full integration of the system's multiple-body Newtonian equations of motion. The two-planet solution yields a significantly improved fit to the previously published radial velocities. The two planets are strongly interacting and exchange angular momentum in a 5:1 mean motion resonance, yet remain stable as they mutually excite orbital eccentricities and periastron advances.

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