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arXiv 0804.4496astro-ph
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太阳系外行星HD 74156 d的成功预报

The Successful Prediction of the Extrasolar Planet HD 74156 d

Rory Barnes, Krzysztof Gozdziewski, Sean N. Raymond

摘要:

大多数第一次发现的太阳系外多行星系统被发现接近动态不稳定的配置。然而,少数观测到的多行星系统(例如HD 74156)并没有显示出这种特征。这些系统可以共享这个属性,如果它们包含一个额外的行星之间的那些已知的。以前的研究确定了假设行星的属性,这些属性将使这些系统接近不稳定。HD 74156中的假设行星预计质量与土星相当,半长轴在0.9到1.4天文单位之间,离心率小于0.2。HD 74156 d是一颗质量为1.3土星质量的行星,偏心率为0.25,最近宣布。我们重新分析了这个系统的所有已发表数据,以便对新行星的属性进行更严格的限制。我们发现这颗行星有两个可能的轨道,一个接近已经确定的轨道,另一个(与数据拟合稍好)在~0.89 AU。我们还回顾了其他行星预测的现状,讨论了观测到的单行星系统,并提出了其他可能包含行星的系统。HD 74156 d存在的确认表明行星形成是一个有效的过程,行星系统通常应该包含许多行星。

英文摘要:

Most of the first-discovered extrasolar multi-planet systems were found to lie close to dynamically unstable configurations. However a few observed multi-planet systems (e.g. HD 74156) did not show this trait. Those systems could share this property if they contain an additional planet in between those that are known. Previous investigations identified the properties of hypothetical planets that would place these systems near instability. The hypothetical planet in HD 74156 was expected to have a mass about equal to that of Saturn, a semi-major axis between 0.9 and 1.4 AU, and an eccentricity less than 0.2. HD 74156 d, a planet with a mass of 1.3 Saturn masses at 1.04 AU with an eccentricity of 0.25, was recently announced. We have reanalyzed all published data on this system in order to place tighter constraints on the properties of the new planet. We find two possible orbits for this planet, one close to that already identified and another (with a slightly better fit to the data) at ~0.89 AU. We also review the current status of other planet predictions, discuss the observed single planet systems, and suggest other systems which may contain planets in between those that are already known. The confirmation of the existence of HD 74156 d suggests that planet formation is an efficient process, and planetary systems should typically contain many planets.

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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