Long-Period Objects in the Extrasolar Planetary Systems 47 UMa and 14 Her

Details Long-Period Objects in the Extrasolar Planetary Systems 47 UMa and 14 Her Long-Period Objects in the Extrasolar Planetary Systems 47 UMa and 14 Her

2006-09-05

arxiv.org/abs/astro-ph/0609117v1

Astrophys.J.654:625-632,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ

Scientific paper

10.1086/509110

The possible existence of additional long-period planetary-mass objects in the extrasolar planetary systems 47 UMa and 14 Her is investigated. We combine all available radial-velocity data on these stars, spanning up to 18 years. For the 47 UMa system, we show that while a second planet improves the fit to all available data, there is still substantial ambiguity as to the orbital parameters of the proposed planetary companion 47 UMa c. We also present new observations which clearly support a long-period companion in the 14 Her system. With a period of 6906+/-70 days, 14 Her c may be in a 4:1 resonance with the inner planet. We also present revised orbital solutions for 7 previously known planets incorporating recent additional data obtained with the 2.7m Harlan J. Smith Telescope at McDonald Observatory.

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