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arXiv 0704.0917astro-ph
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HARPS搜寻太阳系外的南半球行星。IX。围绕HD 100777、HD 190647和HD 221287运行的系外行星

The HARPS search for southern extra-solar planets. IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287

Dominique Naef, Michel Mayor, Willy Benz, Francois Bouchy, Gaspare Lo Curto, Christophe Lovis, Claire Moutou, Francesco Pepe, Didier Queloz, Nuno C. Santos, Stephane Udry

摘要:

HARPS高分辨率高精度摄谱仪自2003年下半年起提供给天文学界。从那时起,我们一直在使用这台仪器来监测大量太阳型恒星(约1400颗恒星)的径向速度,以寻找它们可能的低质量伴星。在我们调查的目标中,一个是在体积有限的样本中显着增加检测到的太阳系外行星的数量,以提高我们对其轨道要素分布的了解,从而为行星形成模型提供更好的约束。本文给出了HD 100777、HD 190647和HD 221287这3颗太阳型恒星的HARPS径向速度数据和轨道解。HD 100777的径向速度数据最好的解释是在384天的偏心轨道上存在一个1.1 M_Jup的行星伴星(e=0.36)。对稍微演化的恒星HD 190647的轨道拟合显示,在中等偏心轨道(e=0.18)上存在一个长周期(P=1038 d)1.9 M_Jup的行星伴星。HD 221287在456天的轨道上运行着一颗3.1兆焦耳的行星。这个轨道的形状不是很好的约束,因为我们的非最佳的时间覆盖范围,因为存在异常大的残差。我们发现这些大的残差的线索,导致从谱线轮廓变化可能引起恒星活动相关的过程。

英文摘要:

The HARPS high-resolution high-accuracy spectrograph is offered to the astronomical community since the second half of 2003. Since then, we have been using this instrument for monitoring radial velocities of a large sample of Solar-type stars (~1400 stars) in order to search for their possible low-mass companions. Amongst the goals of our survey, one is to significantly increase the number of detected extra-solar planets in a volume-limited sample to improve our knowledge of their orbital elements distributions and thus obtain better constraints for planet-formation models. In this paper, we present the HARPS radial-velocity data and orbital solutions for 3 Solar-type stars: HD 100777, HD 190647, and HD 221287. The radial-velocity data of HD 100777 is best explained by the presence of a 1.1 M_Jup planetary companion on a 384--day eccentric orbit (e=0.36). The orbital fit obtained for the slightly evolved star HD 190647 reveals the presence of a long-period (P=1038 d) 1.9 M_Jup planetary companion on a moderately eccentric orbit (e=0.18). HD 221287 is hosting a 3.1 M_Jup planet on a 456--day orbit. The shape of this orbit is not very well constrained because of our non-optimal temporal coverage and because of the presence of abnormally large residuals. We find clues for these large residuals to result from spectral line profile variations probably induced by stellar activity related processes.

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