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REFINED SYSTEM PARAMETERS AND TTV STUDY OF TRANSITING EXOPLANETARY SYSTEM HAT-P-20
Sun LL(孙磊磊)1,2,3; Gu SH(顾盛宏)1,2,3; Wang XB(王晓彬)1,2,3; Cameron, AC4; Cao DT(曹东涛)1,2,3; Wang YB(王夷博)1,2,3; Xiang Y(项越)1,2,3; Hui, HK5; Kwok, CT5; Yeung, B6; Horta, FG7; Wang, XB
发表期刊ASTRONOMICAL JOURNAL
2017
卷号153期号:1页码:28-38
DOI10.3847/1538-3881/153/1/28
产权排序第1完成单位
收录类别SCI
关键词Planetary Systems Stars: Individual (Hat-p-20) Techniques: Photometric
摘要We report new photometric observations of the transiting exoplanetary system HAT-P-20, obtained using CCD cameras at Yunnan Observatories and Ho Koon Nature Education cum Astronomical Centre, China, from 2010 to 2013, and Observatori Ca l'Ou, Sant Marti Sesgueioles, Spain, from 2013 to 2015. The observed data are corrected for systematic errors according to the coarse de-correlation and SYSREM algorithms, so as to enhance the signal of the transit events. In order to consistently model the star spots and transits of this exoplanetary system, we develop a highly efficient tool STMT based on the analytic models of Mandel & Agol and Montalto et al. The physical parameters of HAT-P-20 are refined by homogeneously analyzing our new data, the radial velocity data, and the earlier photometric data in the literature with the Markov chain Monte Carlo technique. New radii and masses of both host star and planet are larger than those in the discovery paper due to the discrepancy of the radius among K-dwarfs between predicted values by standard stellar models and empirical calibration from observations. Through the analysis of all available mid-transit times calculated with the normal model and spotted model, we conclude that the periodic transit timing variations in these transit events revealed by employing the normal model are probably induced by spot crossing events. From the analysis of the distribution of occulted spots by HAT-P-20b, we constrain the misaligned architecture between the planetary orbit and the spin of the host star.
项目资助者National Natural Science Foundation of China(U1531121, 10873031, 11473066)
语种英语
学科领域天文学
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2017-01-13
WOS记录号WOS:000392023200001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LOW-MASS STARS ; SPIN-ORBIT ALIGNMENT ; LIGHT-CURVE ; MAIN-SEQUENCE ; CHROMOSPHERIC ACTIVITY ; PLANETARY TRANSIT ; STELLAR ROTATION ; GIANT PLANET ; HOST STARS ; SPOTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11896
专题系外行星研究组
中国科学院天体结构与演化重点实验室
通讯作者Wang, XB
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK
5.Ho Koon Nature Education cum Astronomical Centre, Sik Sik Yuen, Hong Kong, China
6.Hong Kong Astronomical Society, Hong Kong, China
7.Observatori Ca l'Ou, C/de Dalt 18, Sant Martí Sesgueioles, Spain
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GB/T 7714
Sun LL,Gu SH,Wang XB,et al. REFINED SYSTEM PARAMETERS AND TTV STUDY OF TRANSITING EXOPLANETARY SYSTEM HAT-P-20[J]. ASTRONOMICAL JOURNAL,2017,153(1):28-38.
APA Sun LL.,Gu SH.,Wang XB.,Cameron, AC.,Cao DT.,...&Wang, XB.(2017).REFINED SYSTEM PARAMETERS AND TTV STUDY OF TRANSITING EXOPLANETARY SYSTEM HAT-P-20.ASTRONOMICAL JOURNAL,153(1),28-38.
MLA Sun LL,et al."REFINED SYSTEM PARAMETERS AND TTV STUDY OF TRANSITING EXOPLANETARY SYSTEM HAT-P-20".ASTRONOMICAL JOURNAL 153.1(2017):28-38.
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