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A model of Saturn inferred from its measured gravitational field
Kong, Dali1,2; Zhang, Keke2,3; Schubert, Gerald4; Anderson, John D.5
2018-04-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume18Issue:4Pages:8
Corresponding AuthorZhang, Keke(kzhang@ex.ac.uk)
AbstractWe 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.
Keywordgravitation planets and satellites: individual (Saturn) planets and satellites: interiors
DOI10.1088/1674-4527/18/4/38
WOS KeywordGIANT PLANETS ; INTERNAL STRUCTURE ; ZONAL FLOWS ; INTERIORS ; ROTATION ; EQUATION ; JUPITER
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000430282700002
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22494
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Keke
Affiliation1.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
Recommended Citation
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.
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