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The shape, internal structure and gravity of the fast spinner beta Pictoris b

文献类型：期刊论文

作者Kong, Dali1,2; Liao, Xinhao1; Zhang, Keke2; Schubert, Gerald3
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2014-11-21
卷号445期号:1页码:L26-L30
关键词planets and satellites: gaseous planets planets and satellites: interiors
英文摘要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.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]GIANT PLANETS ; INTERIORS ; MODELS ; DISK
收录类别SCI
语种英语
WOS记录号WOS:000344231000006
源URL[http://119.78.226.72/handle/331011/16237]  
专题上海天文台_天文地球动力学研究中心
作者单位1.Shanghai Astron Observ, Key Lab Planetary Sci, Shanghai 200030, Peoples R China
2.Univ Exeter, Ctr Geophys & Astrophys Fluid Dynam, Exeter EX4 4QF, Devon, England
3.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
推荐引用方式
GB/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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来源：上海天文台

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