The secular evolution and dynamical architecture of the Neptunian triplet planetary system HD 69830

	The secular evolution and dynamical architecture of the Neptunian triplet planetary system HD 69830
	Kinoshita, Hiroshi ; Li, Guangyu ; Ji, Jianghui ; Liu, Lin
刊名	ASTROPHYSICAL JOURNAL
	2007-03-10
卷号	657 期号:2 页码:1092-1097
关键词	Methods : N-body Simulations Planetary Systems Stars : Individual (Hd 69830 47 Uma 55 Cancri Hd 160691 Gj 876)
英文摘要	We perform numerical simulations to study the secular orbital evolution and dynamical structure in the HD 69830 planetary system, using the best-fit orbital solutions by Lovis and coworkers. In the simulations, we show that a triplet Neptunian system is stable for at least 2 Gyr and that the stability would not be greatly influenced even if we varied the planetary masses. In addition, we employ Laplace-Lagrange secular theory to investigate the long-term behavior of the system, and the outcomes demonstrate that this theory can well describe and predict the secular orbital evolution for three Neptune-mass planets, where the secular periods and amplitudes of the eccentricities are in good agreement with those from direct numerical integrations. We first reveal that the secular periods of the eccentricity, e(1) and e(2), are identical. Moreover, we extensively explore the planetary configuration of three Neptune-mass companions with one massive terrestrial planet in 0.07 AU <= a <= 1.20 AU, to examine the potential asteroid architecture. We underline that there are stable zones lasting for at least 10(5) yr for low-mass terrestrial planets located between 0.3 and 0.5 AU and between 0.8 and 1.2 AU. We also find that the secular resonances can excite the eccentricities of the terrestrial bodies and that the accumulation or depletion of the asteroid belt is also shaped by orbital resonances of the outer planets; for example, the asteroidal gaps at the 2 : 1 and 3 : 2 mean motion resonances with planet c. In a dynamical sense, the proper candidate regions for the existence of potential terrestrial planets or habitable zones are 0.35 AU < a < 0.50 AU and 0.80 AU < a < 1.00 AU for relatively low eccentricities, implying the possible asteroidal structure in the system.
语种	英语
WOS记录号	WOS:000244928500034
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8964]
专题	国家天文台_应用天文研究部
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 3.Nanjing Univ, Dept Astron, Nanjing 210008, Peoples R China 4.Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA 5.Natl Astron Observ, Tokyo 181, Japan
推荐引用方式 GB/T 7714	Kinoshita, Hiroshi,Li, Guangyu,Ji, Jianghui,et al. The secular evolution and dynamical architecture of the Neptunian triplet planetary system HD 69830[J]. ASTROPHYSICAL JOURNAL,2007,657(2):1092-1097.
APA	Kinoshita, Hiroshi,Li, Guangyu,Ji, Jianghui,&Liu, Lin.(2007).The secular evolution and dynamical architecture of the Neptunian triplet planetary system HD 69830.ASTROPHYSICAL JOURNAL,657(2),1092-1097.
MLA	Kinoshita, Hiroshi,et al."The secular evolution and dynamical architecture of the Neptunian triplet planetary system HD 69830".ASTROPHYSICAL JOURNAL 657.2(2007):1092-1097.