A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION

	A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION
	Sato, Bun'ei 1; Wang, Liang2 ; Liu, Yu-Juan2 ; Zhao, Gang2 ; Omiya, Masashi 3; Harakawa, Hiroki 3; Nagasawa, Makiko 4; Wittenmyer, Robert A.5,6; Butler, Paul 7; Song, Nan2
刊名	ASTROPHYSICAL JOURNAL
	2016-03-01
卷号	819 期号:1
关键词	planetary systems stars: individual (HD 47366) techniques: radial velocities
英文摘要	We report the detection of a double planetary system around the evolved intermediate-mass star HD 47366 from precise radial-velocity measurements at the Okayama Astrophysical Observatory, Xinglong Station, and Australian Astronomical Observatory. The star is a K1 giant with a mass of 1.81 +/- 0.13 M-circle dot, a radius of 7.30 +/- 0.33 R-circle dot, and solar metallicity. The planetary system is composed of two giant planets with minimum masses of 1.75(-0.17)(+0.20) M-J and 1.86(-0.15)(+0.16) M-J, orbital periods of 363.3(-2.4)(+2.5) days and 684.7(-4.9)(+5.0) days, and eccentricities of 0.089(-0.060)(+0.079) and 0.278(-0.094)(+0.067), respectively, which are derived by a double Keplerian orbital fit to the radial-velocity data. The system adds to the population of multi-giant-planet systems with relatively small orbital separations, which are preferentially found around evolved intermediate-mass stars. Dynamical stability analysis for the system revealed, however, that the best-fit orbits are unstable in the case of a prograde configuration. The system could be stable if the planets were in 2: 1 mean-motion resonance, but this is less likely, considering the observed period ratio and eccentricity. A present possible scenario for the system is that both of the planets have nearly circular orbits, namely the eccentricity of the outer planet is less than similar to 0.15, which is just within 1.4 sigma of the best-fit value, or the planets are in a mutually retrograde configuration with a mutual orbital inclination larger than 160 degrees.
收录类别	SCI
语种	英语
WOS记录号	WOS:000372303400059
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5417]
专题	国家天文台_光学天文研究部
作者单位	1.Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 3.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 4.Kurume Univ, Sch Med, Dept Phys, 67 Asahi Machi, Kurume, Fukuoka 8300011, Japan 5.Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia 6.Univ New S Wales, Australian Ctr Astrobiol, Sydney, NSW 2052, Australia 7.Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd NW, Washington, DC 20015 USA 8.Natl Inst Nat Sci, Natl Astron Observ Japan, Okayama Astrophys Observ, 3037-5 Ooaza Honjyo, Kamogata, Okayama 7190232, Japan 9.Grad Univ Adv Studies, Hayama, Kanagawa 2400193, Japan 10.Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan
推荐引用方式 GB/T 7714	Sato, Bun'ei,Wang, Liang,Liu, Yu-Juan,et al. A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION[J]. ASTROPHYSICAL JOURNAL,2016,819(1).
APA	Sato, Bun'ei.,Wang, Liang.,Liu, Yu-Juan.,Zhao, Gang.,Omiya, Masashi.,...&Ida, Shigeru.(2016).A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION.ASTROPHYSICAL JOURNAL,819(1).
MLA	Sato, Bun'ei,et al."A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION".ASTROPHYSICAL JOURNAL 819.1(2016).