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arXiv 1602.04683astro-ph.EP
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Beta Pic b作为凌日行星的轨道

The orbit of Beta Pic b as a transiting planet

A. Lecavelier des Etangs, A. Vidal-Madjar

摘要:

在1981年,美如画座β显示出强烈而快速的光度变化,可能是由于一颗过境的巨行星。后来,这颗恒星的一颗行星质量的伴星Beta Pic b被使用图像识别出来。在不同时期(2003年和2009-2015年)的观测中,发现这颗行星与恒星的投影距离为6至9 AU,并显示这颗行星处于边缘轨道上。观测到的运动与1981年的一次低合相一致,而β Pic b可能是解释当时观测到的光度事件的凌日行星。假设1981年的事件与边缘轨道上的Beta Pic b凌日或下合有关,我们搜索的行星轨道与迄今为止发表的所有行星位置测量结果一致。我们发现两个不同的轨道,是兼容的所有这些限制:(一)轨道的周期为17.97 $\pm$ 0.08年,随着偏心率约0.12和(二)轨道的周期为36.38 $\pm$ 0.13年,一个更大的偏心率约0.32。在不久的将来,新的成像观测应该使我们能够区分这两个不同的轨道。我们还估计了下一次凌日的可能日期,最早可能发生在2017年或2018年,即使是长周期轨道。

英文摘要:

In 1981, Beta Pictoris showed strong and rapid photometric variations possibly due to a transiting giant planet. Later, a planetary mass companion to the star, Beta Pic b, was identified using imagery. Observations at different epochs (2003 and 2009-2015) detected the planet at a projected distance of 6 to 9 AU from the star and showed that the planet is on an edge-on orbit. The observed motion is consistent with an inferior conjunction in 1981, and Beta Pic b can be the transiting planet proposed to explain the photometric event observed at that time. Assuming that the 1981 event is related to the transit or the inferior conjunction of Beta Pic b on an edge-on orbit, we search for the planetary orbit in agreement with all the measurements of the planet position published so far. We find two different orbits that are compatible with all these constraints: (i) an orbit with a period of 17.97$\pm$0.08 years along with an eccentricity of around 0.12 and (ii) an orbit with a period of 36.38$\pm$0.13 years and a larger eccentricity of about 0.32. In the near future, new imaging observations should allow us to discriminate between these two different orbits. We also estimate the possible dates for the next transits, which could take place as early as 2017 or 2018, even for a long-period orbit.

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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