对凌食系外行星系统WASP-32的测光观测与研究

发布时间：2018-05-12 09:16

本文选题：太阳系外行星 + WASP-32b　；参考：《中国科学院研究生院（云南天文台）》2014年硕士论文

【摘要】：太阳系外行星系统的物理参数在研究行星系统的形成与演化上扮演着极其重要的角色，而对太阳系外行星系统的研究也为我们探究太阳系自身的形成与演化提供了更多样本。对系外行星系统的凌食事件进行测光观测是获取行星系统物理参数的特别重要的方法。通过对凌食事件的光变曲线进行分析，能够获得行星的半径和轨道倾角。加上对视向速度曲线的分析，就可以得到行星的质量和其他物理参数，而这些系统参数又是理解行星结构、形成及演化的关键参数。此外，，通过对已知系外行星系统的凌食事件进行长期监测，还可以探测其Transit TimingVariation（TTV）和Transit Duration Variation（TDV）信号，进而对系统中尚未被发现的其他行星天体进行探测与研究。在2010年到2012年期间，我们利用云南天文台的1m望远镜及香港HokoonNature Education cum Astronomical Centre的0.5m望远镜，对太阳系外行星系统WASP-32的凌食事件进行了测光观测。为了提高凌食光变曲线的信噪比，我们利用coarse de-correlation和SYSREM方法对测光数据中的系统误差进行了改正。通过联合文献中的视向速度曲线、光变曲线以及我们新观测的光变曲线，我们用Markov Chain Monte Carlo（MCMC）技术对系统的物理参数进行了分析求解。与前人的分析结果相比，我们的新结果确认了行星的公转轨道为圆轨道(e=0)；新得到的行星系统物理参数解决了以前不同研究团队研究结果不一致的问题，并且我们的研究结果整体精度更高。通过对所有完整且对称的光变曲线的凌食中心时刻进行分析，我们得到了WASP-32b更加精确的轨道周期，到目前为止，在这些凌食事件中没有发现明显的TTV现象。
[Abstract]:The physical parameters of the extrasolar planetary system play an important role in the formation and evolution of the planetary system, and the study of the extrasolar planetary system provides us with more samples to study the formation and evolution of the solar system itself. Photometry is a very important method for obtaining physical parameters of exoplanet system. The radius of the planet and the inclination of the orbit can be obtained by analyzing the light variation curve of the transit event. Combined with the analysis of the apparent velocity curve, the mass and other physical parameters of the planets can be obtained, and these parameters are the key parameters for understanding the structure, formation and evolution of the planets. In addition, through the long-term monitoring of the transgression events of the known exoplanet system, the signals of Transit timing variation TTV) and Transit Duration variation TV) can be detected, and then other planetary celestial bodies which have not been found in the system can be detected and studied. From 2010 to 2012, we made use of the 1m telescope of Yunnan Observatory and the 0.5m telescope of Hong Kong HokoonNature Education cum Astronomical Centre to measure the transgression events of the extrasolar planetary system WASP-32. In order to improve the signal-to-noise ratio (SNR) of the luminous curve, the systematic errors in the photometric data were corrected by coarse de-correlation and SYSREM methods. The physical parameters of the system are analyzed and solved by combining the apparent velocity curve, the light variation curve and the new observational curve in the literature. The physical parameters of the system are analyzed and solved by using the Markov Chain Monte Carlos MCMC technique. Compared with the previous analysis results, our new results confirm that the orbit of the planets is a circular orbit, and the new physical parameters of the planetary system solve the problem that the previous results of different research teams are inconsistent. And the overall accuracy of our research results is higher. By analyzing all the complete and symmetrical optical transition curves, we get a more accurate orbital period of WASP-32b. Up to now, no obvious TTV phenomenon has been found in these transgressions.
【学位授予单位】：中国科学院研究生院（云南天文台）
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P125.8

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