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arXiv 0903.1845astro-ph.EP
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CoRoT-1b的transit次数分析

An analysis of the transit times of CoRoT-1b

Jacob L. Bean

摘要:

我报告的结果,从过境时间的研究CoRoT-1b,这是第一个行星发现的CoRoT。对管道简化的CoRoT光变曲线的分析产生了行星和恒星的物理和轨道参数的新确定,以及35个单独的过境时间,典型精度为36秒。我估计行星与恒星的半径比为0.1433 +/- 0.0010,行星轨道半长轴与主星半径的比为4.751 +/- 0.045,行星的轨道倾角为83.88 +/- 0.29度。观测到的凌日时间与CoRoT-1b具有恒定周期一致,并且没有证据表明系统中存在其他行星。我利用观测到的凌日时间的恒定性来设定一个假设的额外行星在附近稳定轨道上的质量限制。我确定,最严格的限制(4 M_地球在3西格玛置信度)可以放置在行星居住在1:2平均运动共振与过境行星。相比之下,数据产生较不严格的限制行星附近的1:3平均运动共振(5 M_jup在3西格玛的信心)比周围的参数空间。此外,我用模拟来研究什么样的敏感性,可以从一个类似的系统在一个CoRoT长期运行(100个连续的过境时间)测量的数据分析获得额外的行星。我发现,对于这样的情况下,行星质量大于火星(0.2 M_地球)的两倍,在1:2的平均运动共振将导致高显着的过境时间偏差。因此,这些行星可以使用CoRoT长期运行数据来检测或排除。我的结论是,CoRoT数据确实将是非常有用的搜索行星的过境计时方法。

英文摘要:

I report the results from a study of the transit times for CoRoT-1b, which was one of the first planets discovered by CoRoT. Analysis of the pipeline reduced CoRoT light curve yields a new determination of the physical and orbital parameters of planet and star, along with 35 individual transit times at a typical precision of 36 s. I estimate a planet-to-star radii ratio of 0.1433 +/- 0.0010, a ratio of the planet's orbital semimajor axis to the host star radius of 4.751 +/- 0.045, and an orbital inclination for the planet of 83.88 +/- 0.29 deg. The observed transit times are consistent with CoRoT-1b having a constant period and there is no evidence of an additional planet in the system. I use the observed constancy of the transit times to set limits on the mass of a hypothetical additional planet in a nearby, stable orbit. I ascertain that the most stringent limits (4 M_earth at 3 sigma confidence) can be placed on planets residing in a 1:2 mean motion resonance with the transiting planet. In contrast, the data yield less stringent limits on planets near a 1:3 mean motion resonance (5 M_jup at 3 sigma confidence) than in the surrounding parameter space. In addition, I use a simulation to investigate what sensitivity to additional planets could be obtained from the analysis of data measured for a similar system during a CoRoT long run (100 sequential transit times). I find that for such a scenario, planets with masses greater than twice that of Mars (0.2 M_earth) in the 1:2 mean motion resonance would cause high-significance transit time deviations. Therefore, such planets could be detected or ruled out using CoRoT long run data. I conclude that CoRoT data will indeed be very useful for searching for planets with the transit timing method.

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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