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 The shape, internal structure and gravity of the fast spinner beta Pictoris b Kong, Dali1,2; Liao, Xinhao1; Zhang, Keke2; Schubert, Gerald3 2014-11-21 Source Publication MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY ISSN 0035-8711 Volume 445Issue:1Pages:L26-L30 Corresponding Author Kong, Dali() Abstract A young extrasolar gas giant planet, beta Pictoris b, recently discovered in the beta Pictoris system, spins substantially faster than the giant gas planets Jupiter and Saturn. Based on the newly measured parameters - the rotation period of the planet, its mass and radius - together with an assumption that the gas planet beta Pictoris b is in hydrostatic equilibrium and made of a fully compressible barotropic gas with a polytropic index of unity, we are able to compute, via a hybrid inverse method, its non-spherical shape, internal density/pressure distribution and gravitational zonal coefficients up to degree 8. Since the mass M-beta for the planet beta Pictoris b is highly uncertain, various models with different values of M-beta are studied in this Letter, providing the upper and lower bounds for its shape parameter as well as its gravitational zonal coefficients. If M-beta is assumed to be 6M(J) with M-J being Jupiter's mass, we show that the shape of the planet beta Pictoris b is approximately described by an oblate spheroid whose eccentricity at the one-bar surface is $\mathcal {E}_{\beta }=0.369\,28$ with the gravitational coefficient (J(2))(beta) = +15 375.972 x 10(-6). It follows that our results open the possibility of constraining or inferring the mass M-beta of the planet beta Pictoris b if its shape can be measured or constrained. By assuming that the planet beta Pictoris b will shrink to the size of Jupiter in the process of cooling down and, hence, rotate much faster, we also calculate the future shape and internal structure of the planet beta Pictoris b. Keyword planets and satellites: gaseous planets planets and satellites: interiors DOI 10.1093/mnrasl/slu129 WOS Keyword GIANT PLANETS ; INTERIORS ; MODELS ; DISK Indexed By SCI Language 英语 WOS Research Area Astronomy & Astrophysics WOS Subject Astronomy & Astrophysics WOS ID WOS:000344231000006 Publisher OXFORD UNIV PRESS Citation statistics Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS] Document Type 期刊论文 Identifier http://libir.pmo.ac.cn/handle/332002/27785 Collection 中国科学院紫金山天文台 Corresponding Author Kong, Dali Affiliation 1.Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China2.Univ Exeter, Ctr Geophys & Astrophys Fluid Dynam, Exeter EX4 4QF, Devon, England3.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA Recommended CitationGB/T 7714 Kong, Dali,Liao, Xinhao,Zhang, Keke,et al. The shape, internal structure and gravity of the fast spinner beta Pictoris b[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,445(1):L26-L30. APA Kong, Dali,Liao, Xinhao,Zhang, Keke,&Schubert, Gerald.(2014).The shape, internal structure and gravity of the fast spinner beta Pictoris b.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,445(1),L26-L30. MLA Kong, Dali,et al."The shape, internal structure and gravity of the fast spinner beta Pictoris b".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 445.1(2014):L26-L30.
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