Mass of WASP-33b
Mass of WASP-33b
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WASP-33b 的质量
DOI：
10.1051/0004-6361/201526176
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发表时间：
2015
影响因子：
6.5
通讯作者：
D.E. Mkrtichian
中科院分区：
文献类型：
--
作者：
H. Lehmann;E. Guenther;D. Sebastian;M. Döllinger;M. Hartmann;D.E. Mkrtichian
我们分析了δSct星星WASP-33的高分辨率光谱的扩展时间序列，目的是确定其行星WASP-33 b的影响。我们发现十个频率在测量的径向速度。其中三个我们可以归因于以前观察到的光度振荡，由于非径向脉动。一个频率正好与行星的轨道周期一致。相应变化的半振幅为304 ± 20 m s-1。这一发现使我们能够对WASP-33 b的质量进行新的估计，即2.1 ± 0.2木星质量。它的平均密度可能至少是0.6 g cm-3，这是一个可以预期的值，对于一颗质量为1.22 d的行星来说，它绕A型星星的轨道运行。
We analysed an extended time series of high-resolution spectra of theδSct star WASP-33 with the aim to determine the effect of its planet WASP-33b. We found ten frequencies in the measured radial velocities. Three of them we can attribute to previously observed photometric oscillations due to non-radial pulsations. One frequency exactly agrees with the orbital period of the planet. The semi-amplitude of the corresponding variation is 304 ± 20 m s-1. This finding allows us to give a new estimate of the mass of WASP-33b of 2.1 ± 0.2 Jupiter masses. Its mean density probably is at least 0.6 g cm-3, a value that can be expected for a planet of its mass that orbits an A-type star in 1.22 d.