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题名:
对凌食系外行星系统WASP-32的测光观测与研究
其他题名: Photometric observations and study for the transiting exoplanetary system WASP-32
作者: 孙磊磊
学位类别: 硕士
学位专业: 天体物理
学位授予日期: 2014-05-29
授予单位: 中国科学院研究生院(云南天文台)
授予地点: 北京
导师: 顾盛宏
学科分类: 天文学
关键词: 太阳系外行星 ; WASP-32b ; 凌食事件 ; 测光观测 ; 系统物理参数 ; TTV
中文摘要: 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 Timing Variation (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Hokoon Nature 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。
英文摘要: The physical parameters of exoplanetary system play extremely important role in understanding the formation and evolution of the exoplanetary system. The study for exoplanetary systems provides more samples for understanding our solar system. The photometric observation for the transit event of the exoplanet is one of the most significant methods to obtain the planetary physical parameters. Through the analysis of the light curve of an exoplanet transit, the radius and the orbital inclination of the exoplanet can be derived. The mass and other physical parameters of the exo- planet can be inferred through combining the radial velocity data with the transit light curve data. These parameters are very important to understand its structure, formation and evolution. Additionally, the transit timing variation(TTV) and transit duration variation(TDV) of an exoplanet can be taken advantage to probe other unveiled bodies in the same system. Photometric observations for transit events ofWASP-32b were carried out by uti- lizing 1-m telescope of Yunnan Observatories and 0.5-m telescope of Hokoon Nature Education cum Astronomical Centre of Hong Kong from 2010 to 2012. The system- atic errors in the photometric data were eliminated with the coarse de-correlation and SYSREM methods so as to enhance the transit feature. Combined with the radial ve- locity data presented in literature, our newly observed data and the earlier photometric data in the literature are simultaneously analyzed to derive the physical parameters of the system by employing the Markov Chain Monte Carlo(MCMC) technique. In com- parison with previous results, our results confirm thatWASP-32b’s orbit is circular. We have solved the issue that the previous results didn’t agree with each other. Through the analysis of all available mid-transit times of symmetric and complete light curves, we have refined the orbital period of WASP-32b, no evident transit timing variation is found in these transit events.
语种: 中文
总页数: 63
内容类型: 学位论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/6827
Appears in Collections:系外行星研究组_学位论文

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