Detection of planet candidates around K giants. HD 40956, HD 111591, and HD 113996

被引：3
|
作者：
Jeong, G. [1 ,2 ]
Lee, B. -C. [1 ,2 ]
Han, I. [1 ,2 ]
Omiya, M. [3 ]
Izumiura, H. [3 ,4 ]
Sato, B. [5 ]
Harakawa, H. [3 ]
Kambe, E. [4 ]
Mkrtichian, D. [6 ]
机构：
[1] Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
[2] Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea
[3] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[4] Natl Astron Observ Japan, Okayama Astrophys Observ, 3037-5 Honjo, Asakuchi, Okayama 7190232, Japan
[5] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Okayama, Tokyo 1528551, Japan
[6] Natl Astron Res Inst Thailand, Siriphanich Bldg, Chiang Mai, Thailand
来源：
ASTRONOMY & ASTROPHYSICS | 2018年 / 610卷
基金：
日本学术振兴会;
关键词：
stars:; individual:; HD; 40956; 111591; 113996; planetary systems; techniques: radial velocities; RADIAL-VELOCITY VARIATIONS; DOPPLER TOMOGRAPHY; SUBSTELLAR COMPANION; URSAE MINORIS; OKAYAMA HIDES; IODINE CELLS; RED GIANTS; SUBARU HDS; STAR; EXOPLANET;
D O I：
10.1051/0004-6361/201629185
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Aims. The purpose of this paper is to detect and investigate the nature of long-term radial velocity (RV) variations of K-type giants and to confirm planetary companions around the stars. Methods. We have conducted two planet search programs by precise RV measurement using the 1.8 m telescope at Bohyunsan Optical Astronomy Observatory (BOAO) and the 1.88 m telescope at Okayama Astrophysical Observatory (OAO). The BOAO program searches for planets around 55 early K giants. The OAO program is looking for 190 G-K type giants. Results. In this paper, we report the detection of long-period RV variations of three K giant stars, HD 40956, HD 111591, and HD 113996. We investigated the cause of the observed RV variations and conclude the substellar companions are most likely the cause of the RV variations. The orbital analyses yield P = 578.6 +/- 3.3 d, m sin i = 2.7 +/- 0.6 M-J, a = 1.4 +/- 0.1 AU for HD 40956; P = 1056.4 +/- 14.3 d, m sin i = 4.4 +/- 0.4 M-J, a = 2.5 +/- 0.1 AU for HD 111591; P = 610.2 +/- 3.8 d, m sin i = 6.3 +/- 1.0 M-J, a = 1.6 +/- 0.1 AU for HD 113996. Conclusions.
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页数：8
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