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arXiv 0902.0597astro-ph.EPastro-ph.SR
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HD45364,一对行星以3:2的平均运动共振

HD45364, a pair of planets in a 3:2 mean motion resonance

A. C. M. Correia, S. Udry, M. Mayor, W. Benz, J. -L. Bertaux, F. Bouchy, J. Laskar, C. Lovis, C. Mordasini, F. Pepe, D. Queloz

摘要:

使用HARPS摄谱仪精确的径向速度测量揭示了两颗行星围绕太阳型恒星HD 45364运行。伴星的质量分别为0.187 Mjup和0.658 Mjup,半长轴分别为0.681 AU和0.897 AU,偏心率分别为0.168和0.097。对系统的动力学分析进一步显示了两颗行星之间3:2的平均运动共振,这防止了近距离相遇,并确保了系统在5 Gyr以上的稳定性。这是第一次在太阳系外的行星上观察到这样的共振结构,尽管在我们的太阳系中有一个由海王星和冥王星组成的类似结构。这个奇异的行星系可能对行星的形成和迁移情景提供重要的限制。

英文摘要:

Precise radial-velocity measurements with the HARPS spectrograph reveal the presence of two planets orbiting the solar-type star HD45364. The companion masses are 0.187 Mjup and 0.658 Mjup, with semi-major axes of 0.681 AU and 0.897 AU, and eccentricities of 0.168 and 0.097, respectively. A dynamical analysis of the system further shows a 3:2 mean motion resonance between the two planets, which prevents close encounters and ensures the stability of the system over 5 Gyr. This is the first time that such a resonant configuration has been observed for extra-solar planets, although there is an analogue in our Solar System formed by Neptune and Pluto. This singular planetary system may provide important constraints on planetary formation and migration scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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