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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
Source PublicationASTRONOMICAL JOURNAL
2017
Volume153Issue:1Pages:28-38
DOI10.3847/1538-3881/153/1/28
Contribution Rank第1完成单位
Indexed BySCI
KeywordPlanetary Systems Stars: Individual (Hat-p-20) Techniques: Photometric
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[U1531121] ; National Natural Science Foundation of China[10873031] ; National Natural Science Foundation of China[11473066]
Funding OrganizationNational Natural Science Foundation of China[U1531121, 10873031, 11473066]
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2017-01-13
WOS IDWOS:000392023200001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordLOW-MASS STARS ; SPIN-ORBIT ALIGNMENT ; LIGHT-CURVE ; MAIN-SEQUENCE ; CHROMOSPHERIC ACTIVITY ; PLANETARY TRANSIT ; STELLAR ROTATION ; GIANT PLANET ; HOST STARS ; SPOTS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11896
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorWang XB(王晓彬)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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.,...&Horta, FG.(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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