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arXiv 1012.2375astro-ph.EPastro-ph.SR
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附近双星系统引起的恒星摆动:偏心和倾斜轨道

Stellar wobble caused by a nearby binary system: eccentric and inclined orbits

M. H. M. Morais, A. C. M. Correia

摘要:

目前已知的大多数太阳系外行星都是通过测量行星引起的恒星摆动的间接方法发现的。我们以前研究了一个由一颗恒星和一颗邻近的双星组成的三元系统。我们发现,虽然双星对恒星的影响可以与行星引起的恒星摆动区分开来,但由于观测的限制,这两种影响往往无法区分。在这里,我们开发了一个模型,适用于偏心和倾斜的轨道。结果表明,在共面运动的情况下,双星的影响更容易被行星所误认为是赤道上的,而且,当轨道偏心时,双星的影响可能比圆轨道情况下的大。此外,一颗偏心双星可以模仿两颗轨道周期比为2/1的行星。然而,当恒星围绕双星质心的轨道有很高的离心率和合理的约束周期时,应该更容易区分双星和行星的影响。

英文摘要:

Most extrasolar planets currently known were discovered by means of an indirect method that measures the stellar wobble caused by the planet. We previously studied a triple system composed of a star and a nearby binary on circular coplanar orbits. We showed that although the effect of the binary on the star can be differentiated from the stellar wobble caused by a planet, because of observational limitations the two effects may often remain indistinguishable. Here, we develop a model that applies to eccentric and inclined orbits. We show that the binary's effect is more likely to be mistaken by planet(s) in the case of coplanar motion observed equator-on. Moreover, when the orbits are eccentric, the magnitude of the binary's effect may be larger than in the circular case. Additionally, an eccentric binary can mimic two planets with orbital periods in the ratio 2/1. However, when the star's orbit around the binary's center of mass has a high eccentricity and a reasonably well-constrained period, it should be easier to distinguish the binary's effect from a planet.

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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