A model of Saturn inferred from its measured gravitational field

doi:10.1088/1674-4527/18/4/38

	A model of Saturn inferred from its measured gravitational field
	Kong, Dali 1,2; Zhang, Keke 2,3; Schubert, Gerald 4; Anderson, John D.5
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2018-04-01
卷号	18 期号:4 页码:8
关键词	gravitation planets and satellites: individual (Saturn) planets and satellites: interiors
ISSN号	1674-4527
DOI	10.1088/1674-4527/18/4/38
通讯作者	Zhang, Keke(kzhang@ex.ac.uk)
英文摘要	We present an interior model of Saturn with an ice-rock core, a metallic region, an outer molecular envelope and a thin transition layer between the metallic and molecular regions. The shape of Saturn's 1 bar surface is irregular and determined fully self-consistently by the required equilibrium condition. While the ice-rock core is assumed to have a uniform density, three different equations of state are adopted for the metallic, molecular and transition regions. The Saturnian model is constrained by its known mass, its known equatorial and polar radii, and its known zonal gravitational coefficients, J(2n), n = 1, 2, 3. The model produces an ice-rock core with equatorial radius 0.203 R-S, where R-S is the equatorial radius of Saturn at the 1-bar pressure surface; the core density rho(c) = 10388.1 kg m(-3) corresponding to 13.06 Earth masses; and an analytical expression describing the Saturnian irregular shape of the 1-bar pressure level. The model also predicts the values of the higher-order gravitational coefficients, J(8), J(10) and J(12), for the hydrostatic Saturn and suggests that Saturn's convective dynamo operates in the metallic region approximately defined by 0.2 R-S < r(e) < 0.7 R-S, where r(e) denotes the equatorial radial distance from the Saturnian center of figure.
WOS关键词	GIANT PLANETS ; INTERNAL STRUCTURE ; ZONAL FLOWS ; INTERIORS ; ROTATION ; EQUATION ; JUPITER
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000430282700002
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/22493]
专题	中国科学院紫金山天文台
通讯作者	Zhang, Keke
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China 2.Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England 3.Macau Univ Sci & Technol, Lunar & Planetary Sci Lab, Macau, Peoples R China 4.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA 5.Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
推荐引用方式 GB/T 7714	Kong, Dali,Zhang, Keke,Schubert, Gerald,et al. A model of Saturn inferred from its measured gravitational field[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(4):8.
APA	Kong, Dali,Zhang, Keke,Schubert, Gerald,&Anderson, John D..(2018).A model of Saturn inferred from its measured gravitational field.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(4),8.
MLA	Kong, Dali,et al."A model of Saturn inferred from its measured gravitational field".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.4(2018):8.