WASP-21b: a hot-Saturn exoplanet transiting a thick disc star

WASP-21b: a hot-Saturn exoplanet transiting a thick disc star
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WASP-21b:一颗热土星系外行星凌日厚盘状恒星

DOI:
10.1051/0004-6361/201014817
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发表时间:
2010
影响因子:
6.5
通讯作者:
Bouchy F
Bouchy F
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bouchy F

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WASP-21 b是广角行星搜索(WASP)联盟发现的一颗新的凌日系外行星,我们报告了WASP-21 b的发现,并使用FIES,SOPHIE,CORALIE和HARPS光纤馈电阶梯光栅光谱仪进行了建立和表征。利用利物浦望远镜的SuperWASP-North和高精度测光观测,得到了WASP-21 b的4.3 d周期、1.1%凌日深度和3.4 h持续时间。同时拟合的光度和径向速度数据与马尔可夫链蒙特卡罗程序导致土星的质量制度的行星。WASP-21 b的半径为1.07 R,质量为0.30 MJup,密度接近0.24ρ,对应于过境气态巨行星在低密度时的分布峰值。WASP-21 b的主星星金属丰度[Fe/H]为-0.46,这加强了行星密度和主星星金属丰度之间的相关性。此外,有明确的迹象表明,WASP-21 b是第一个属于厚盘的过境行星。
We report the discovery of WASP-21b, a new transiting exoplanet discovered by the Wide Angle Search for Planets (WASP) Consortium and established and characterized with the FIES, SOPHIE, CORALIE and HARPS fiber-fed echelle spectrographs. A 4.3-d period, 1.1% transit depth and 3.4-h duration are derived for WASP-21b using SuperWASP-North and high precision photometric observations at the Liverpool Telescope. Simultaneous fitting to the photometric and radial velocity data with a Markov Chain Monte Carlo procedure leads to a planet in the mass regime of Saturn. With a radius of 1.07RJupand mass of 0.30MJup, WASP-21b has a density close to 0.24ρJupcorresponding to the distribution peak at low density of transiting gaseous giant planets. With a host star metallicity [Fe/H] of –0.46, WASP-21b strengthens the correlation between planetary density and host star metallicity for the five known Saturn-like transiting planets. Furthermore there are clear indications that WASP-21b is the first transiting planet belonging to the thick disc.
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