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arXiv 1202.0265astro-ph.EP
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McDonald天文台行星搜索:新的长周期巨行星和HD 155358系统中的两个相互作用的彗星

The McDonald Observatory Planet Search: New Long-Period Giant Planets, and Two Interacting Jupiters in the HD 155358 System

Paul Robertson, Michael Endl, William D. Cochran, Phillip J. MacQueen, Robert A. Wittenmyer, J. Horner, Erik J. Brugamyer, Attila E. Simon, Stuart I. Barnes, Caroline Caldwell

摘要:

我们提出了四个太阳型(F7-G5)恒星- HD 79498,HD 155358,HD 197037和HD 220773的高精度径向速度(RV)观测-作为麦克唐纳天文台行星搜索计划的一部分。对于这些恒星中的每一颗,我们都看到了开普勒运动的证据,这是由一颗或多颗气体巨行星在长周期轨道上的存在引起的。我们推导出每个系统的轨道参数,并注意到性质(组成,活动等)。的主持人。虽然我们之前已经宣布了双气体巨星HD 155358系统,但我们现在报告的行星c的周期较短。这个新的周期与行星被困在相互2:1的平均运动共振中是一致的。因此,我们进行了深入的稳定性分析,对行星的轨道参数施加了额外的约束。这些结果表明,哈兰J.史密斯2.7米望远镜和霍比-埃伯利望远镜上的光谱仪具有出色的长期RV稳定性。

英文摘要:

We present high-precision radial velocity (RV) observations of four solar-type (F7-G5) stars - HD 79498, HD 155358, HD 197037, and HD 220773 - taken as part of the McDonald Observatory Planet Search Program. For each of these stars, we see evidence of Keplerian motion caused by the presence of one or more gas giant planets in long-period orbits. We derive orbital parameters for each system, and note the properties (composition, activity, etc.) of the host stars. While we have previously announced the two-gas-giant HD 155358 system, we now report a shorter period for planet c. This new period is consistent with the planets being trapped in mutual 2:1 mean-motion resonance. We therefore perform an in-depth stability analysis, placing additional constraints on the orbital parameters of the planets. These results demonstrate the excellent long-term RV stability of the spectrometers on both the Harlan J. Smith 2.7 m telescope and the Hobby-Eberly telescope.

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