Characterization of the HD 17156 planetary system
Characterization of the HD 17156 planetary system
复制标题
HD 17156 行星系统的表征
DOI：
10.1051/0004-6361/200811466
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发表时间：
2008
影响因子：
6.5
通讯作者：
B. Loeillet
中科院分区：
文献类型：
--
作者：
M. Barbieri;R. Alonso;S. Desidera;A. Sozzetti;A. Fiorenzano;J. Almenara;M. Cecconi;R. Claudi;D. Charbonneau;M. Endl;V. Granata;R. Gratton;G. Laughlin;B. Loeillet
目标。改善HD 17156系统的参数（由于其过境行星的偏心和长轨道周期而特殊）并限制恒星同伴的存在。方法.获得了4次凌日的光度数据，并同时获得了SARG@TNG一次凌日的高精度径向速度测量值。HD 17156的模板光谱被用来推导有效温度、重力和金属丰度。对光度和光谱数据进行拟合，以测量恒星和行星的半径以及自旋轨道对准。行星轨道要素和星历表是从拟合得到的。采用ADOPT@TNG采集近红外自适应光学图像。结果我们发现这颗星星的半径为RS = 1.44± 0.03 R π，行星的半径为RP = 1.02± 0.08 R π。凌日星历为Tc = 2454756.73134 ± 0.00020+ N21.21663 ± 0.00045BJD。对Rossiter-McLaughlin效应的分析表明，该系统的自旋轨道与轨道夹角λ = 4.8 ± 5.3。对高分辨率图像的分析没有发现任何与HD 17156的距离在150到1000 Au之间的伴星。
Aims. To improve the parameters of the HD 17156 system (peculiar due to the eccentric and long orbital period of its transiting planet) and constrain the presence of stellar companions. Methods. Photometric data were acquired for 4 transits, and high precision radial velocity measurements were simultaneously acquired with SARG@TNG for one transit. The template spectra of HD 17156 was used to derive effective temperature, gravity, and metallicity. A fit of the photometric and spectroscopic data was performed to measure the stellar and planetary radii, and the spin-orbit alignment. Planet orbital elements and ephemeris were derived from the fit. Near infrared adaptive optic images was acqu ired with ADOPT@TNG. Results. We have found that the star has a radius of RS = 1.44± 0.03R⊙ and the planet RP = 1.02± 0.08RJ . The transit ephemeris is Tc = 2 454 756.73134± 0.00020+ N� 21.21663± 0.00045 BJD. The analysis of the Rossiter-Mclaughlin effect shows that the system is spin orbit aligned with an angleλ = 4.8 ◦ ± 5.3 ◦ . The analysis of high resolution images has not revealed any stellar companion with projected separation between 150 and 1 000 AU from HD 17156.