Trojan Pairs in the HD 128311 and HD 82943 Planetary Systems?

Trojan Pairs in the HD 128311 and HD 82943 Planetary Systems?
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DOI:
10.1086/505318
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发表时间:
2005-10
期刊:
The Astrophysical Journal
影响因子:
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通讯作者:
K. Goździewski;M. Konacki
K. Goździewski;M. Konacki
中科院分区:
其他
文献类型:
--
作者:
K. Goździewski;M. Konacki

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附近的两颗恒星,HD 128311和HD 82943,被认为拥有一对类似木星的行星,涉及到强烈的一阶2:1平均运动共振(MMR)。在这项工作中,我们重新分析了现有的径向速度(RV)测量,并证明了也可以解释观测到的母星的RV变化是由一对特洛伊行星引起的(即,在1:1的MMR中)。我们发现,这些特洛伊木马构型位于扩展的稳定区域中,在这些区域中,尽管行星质量大、偏心率大、轨道相互倾角非零,这些系统仍然可以很容易地生存下来。我们还表明,HD 82943可能在~2AU轨道上拥有一颗以前未知的~0.5MJ的第三颗行星。
Two nearby stars, HD 128311 and HD 82943, are believed to host pairs of Jupiter-like planets involved in a strong first-order 2 : 1 mean motion resonance (MMR). In this work, we reanalyze available radial velocity (RV) measurements and demonstrate that it is also possible to explain the observed RV variations of the parent stars as being induced by a pair of Trojan planets (i.e., in a 1 : 1 MMR). We show that these Trojan configurations reside in extended zones of stability in which such systems can easily survive in spite of the large masses of the planets, large eccentricities, and nonzero mutual inclinations of their orbits. We also show that HD 82943 could harbor a previously unknown third planet of ~0.5MJ in ~2 AU orbit.