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Search for Exoplanets around Northern Circumpolar Stars. II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742
Lee, Byeong-Cheol1,2; Jeong, Gwanghui1,2; Park, Myeong-Gu3; Han, Inwoo1,2; Mkrtichian, David E.4,5; Hatzes, Artie P.6; Gu SH(顾盛宏)7,8; Bai JM(白金明)7,8; Lee, Sang-Min1; Oh, Hyeong-Il3; Kim, Kang-Min1; Lee, Byeong-Cheol(Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 305348, South Korea)
发表期刊ASTROPHYSICAL JOURNAL
2017-07-20
卷号844期号:1
DOI10.3847/1538-4357/aa7577
产权排序第7完成单位
收录类别SCI
关键词Planetary Systems Stars: Oscillations (Including Pulsations) Techniques: Radial Velocities Stars: Individual (Hd 36384 Hd 52030 Hd 208742)
摘要We present the detection of long-period RV variations in HD. 36384, HD. 52030, and HD. 208742 by using the high-resolution, fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) for the precise radial velocity (RV) survey of about 200 northern circumpolar stars. Analyses of RV data, chromospheric activity indicators, and bisector variations spanning about five years suggest that the RV variations are compatible with planet or brown dwarf companions in Keplerian motion. However, HD. 36384 shows photometric variations with a period very close to that of RV variations as well as amplitude variations in the weighted wavelet Z-transform (WWZ) analysis, which argues that the RV variations in HD. 36384 are from the stellar pulsations. Assuming that the companion hypothesis is correct, HD. 52030 hosts a companion with minimum mass 13.3 M-Jup orbiting in 484 days at a distance of 1.2 au. HD. 208742 hosts a companion of 14.0 M-Jup at 1.5 au with a period of 602 days. All stars are located at the asymptotic giant branch (AGB) stage on the H-R diagram after undergoing. the helium flash and leaving. the giant clump. With stellar radii of 53.0 R-circle dot and 57.2 R-circle dot for HD. 52030 and HD. 208742, respectively, these stars may be the largest yet, in terms of stellar radius, found to host substellar companions. However, given possible RV amplitude variations and the fact that these are highly evolved stars, the planet hypothesis is not yet certain.
项目资助者Korea Astronomy and Space Science Institute (KASI)(2016-1-832-01) ; KASI ; Ministry of Science and Technology of Thailand ; Deutsch Forschungsgemeinschaft (DFG)(HA 3279/8-1) ; NSFC(U1531121) ; National Research Foundation of Korea to the Center for Galaxy Evolution Research(2012-0027910)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000405906300012
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]INTERMEDIATE-MASS STARS ; SUBSTELLAR COMPANION ; BROWN-DWARF ; ATMOSPHERIC PARAMETERS ; PLANETARY COMPANION ; EXTRASOLAR PLANETS ; STELLAR EVOLUTION ; ISOCHRONES ; SYSTEMS ; SAMPLE
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11574
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Lee, Byeong-Cheol(Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 305348, South Korea)
作者单位1.Korea Astronomy and Space Science Institute 776, Daedeokdae-ro, Yuseong-gu, Daejeon 305-348, Korea
2.Astronomy and Space Science Major, Korea University of Science and Technology, Gajeong-ro Yuseong-gu, Daejeon 305-333, Korea
3.Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 702-701, Korea
4.National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand
5.Crimean Astrophysical Observatory, Taras Shevchenko National University of Kyiv, Nauchny, Crimea, 98409, Ukraine
6.Thüringer Landessternwarte Tautenburg (TLS), Sternwarte 5, D-07778 Tautenburg, Germany
7.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
8.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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Lee, Byeong-Cheol,Jeong, Gwanghui,Park, Myeong-Gu,et al. Search for Exoplanets around Northern Circumpolar Stars. II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742[J]. ASTROPHYSICAL JOURNAL,2017,844(1).
APA Lee, Byeong-Cheol.,Jeong, Gwanghui.,Park, Myeong-Gu.,Han, Inwoo.,Mkrtichian, David E..,...&Lee, Byeong-Cheol.(2017).Search for Exoplanets around Northern Circumpolar Stars. II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742.ASTROPHYSICAL JOURNAL,844(1).
MLA Lee, Byeong-Cheol,et al."Search for Exoplanets around Northern Circumpolar Stars. II. The Detection of Radial Velocity Variations in M Giant Stars HD 36384, HD 52030, and HD 208742".ASTROPHYSICAL JOURNAL 844.1(2017).
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