HARPS搜寻太阳系外行星XVII。围绕BD -17 0063、HD 20868、HD 73267、HD 131664、HD 145377、HD 153950的六颗长周期巨行星
The HARPS search for southern extra-solar planets XVII. Six long-period giant planets around BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377, HD 153950
摘要：
我们报告发现六个新的主序星的亚恒星同伴，通过多个多普勒测量仪器HARPS安装在ESO 3.6米望远镜，拉西拉，智利。这些太阳系外行星围绕恒星BD -17 0063，HD 20868，HD 73267，HD 131664，HD 145377，HD 153950运行。本文描述了最适合观测数据的轨道特征，以及恒星和行星参数。伴星的质量从2到18个木星质量不等，周期从100到2000天不等。观测数据进行了仔细分析活动引起的影响，我们得出结论的可靠性所观察到的径向速度变化的系外行星起源。特别令人感兴趣的是围绕着富含金属的HD 131664的非常大质量的行星（或棕矮星伴星），其M2 sini = 18.15 MJup，轨道周期为5.34年。这些新发现加强了迄今为止已知的系外行星样本的观测统计特性。
英文摘要：
We report the discovery of six new substellar companions of main-sequence stars, detected through multiple Doppler measurements with the instrument HARPS installed on the ESO 3.6m telescope, La Silla, Chile. These extrasolar planets are orbiting the stars BD -17 0063, HD 20868, HD 73267, HD 131664, HD 145377, HD 153950. The orbital characteristics which best fit the observed data are depicted in this paper, as well as the stellar and planetary parameters. Masses of the companions range from 2 to 18 Jupiter masses, and periods range from 100 to 2000 days. The observational data are carefully analysed for activity-induced effects and we conclude on the reliability of the observed radial-velocity variations as of exoplanetary origin. Of particular interest is the very massive planet (or brown-dwarf companion) around the metal-rich HD 131664 with M2sini= 18.15 MJup, and a 5.34-year orbital period. These new discoveries reinforces the observed statistical properties of the exoplanet sample as known so far.
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