2006/09/05 by Robert A. Wittenmyer, Michael Endl, William D. Cochran · 2 citations
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Exoplanet #Observatory #Orbital period #Physics #Planet #Planetary system #Radial velocity #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/509110
published as Astrophys.J.654:625-632,2006 · Accepted for publication in ApJ
arxiv created 2006/09/05 · openalex publication_date 2006/12/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 yr. 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 that 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 seven previously known planets, incorporating recent additional data obtained with the 2.7 m Harlan J. Smith Telescope at McDonald Observatory.