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

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

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

a r X i v : a s t r o - p h / 0 6 0 9 1 1 7 v 1 5 S e p 2 0 0 6 Accepted for publication in ApJ Preprint typeset using LATEX style emulateapj v. 6/22/04 LONG-PERIOD OBJECTS IN THE EXTRASOLAR PLANETARY SYSTEMS 47 UMA AND 14 HER1 Robert A. Wittenmyer, Michael Endl, William D. Cochran McDonald Observatory, University of Texas at Austin, Austin, TX 78712 Accepted for publication in ApJ ABSTRACT 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. Subject headings: stars: individual, 47 UMa, 14 Her – stars: planetary systems – extrasolar planets – techniques: radial velocities 1. INTRODUCTION The longest-running radial-velocity surveys are now approaching time baselines of 16-18 years (Butler et al. 1996; Cochran et al. 1997). These surveys now achieve internal measurement precisions such that the signals from long-period giant planets (P ~ 10yr) are now enter- ing the realm of detectability (Wittenmyer et al. 2006). For example, the High Resolution Spectrograph (HRS) on the Hobby-Eberly Telescope (HET) now has a ve- locity precision of 3-4 m s?1(Cochran et al. 2004), the Keck HIRES is achieving 1-2 m s?1 since its 2004 CCD upgrade (Butler et al. 2006), and the HARPS instrument has demonstrated precision better than 1 m

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