High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2★: High-precision defocused photometry of WASP-2
High-precision photometry by telescope defocusing - III. The transiting planetary system WASP-2★: High-precision defocused photometry of WASP-2
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DOI：
10.1111/j.1365-2966.2010.17238.x
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发表时间：
2010-11
影响因子：
4.8
通讯作者：
J. Southworth;L. Mancini;S. Novati;M. Dominik;M. Glitrup;T. Hinse;U. Jørgensen;M. Mathiasen;D. Ricci;G. Maier;F. Zimmer;V. Bozza;P. Browne;I. Bruni;M. Burgdorf;M. Dall’ora;F. Finet;K. Harpsoe;M. Hundertmark;C. Liebig;S. Rahvar;G. Scarpetta;J. Skottfelt;B. Smalley;C. Snodgrass;J. Surdej
中科院分区：
文献类型：
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作者：
J. Southworth;L. Mancini;S. Novati;M. Dominik;M. Glitrup;T. Hinse;U. Jørgensen;M. Mathiasen;D. Ricci;G. Maier;F. Zimmer;V. Bozza;P. Browne;I. Bruni;M. Burgdorf;M. Dall’ora;F. Finet;K. Harpsoe;M. Hundertmark;C. Liebig;S. Rahvar;G. Scarpetta;J. Skottfelt;B. Smalley;C. Snodgrass;J. Surdej
我们提出了高精度测光的三个凌日的太阳系外行星系统WASP-2，通过散焦的望远镜，并实现散射0.42和0.73毫等之间的最佳拟合模型。这些数据是用jktebopcode建模的，并考虑到了最近发现的靠近该系统的微弱星星发出的光。WASP-2系统的物理特性是使用来自五组不同恒星演化模型的列表预测得出的，允许指定统计和系统误差条。我们求得该行星的质量和半径为Mb = 0.846 ± 0.055 ± 0.023Mpa，Rb = 1.043 ± 0.029 ± 0.015RJup。它的平衡温度很低，为1281 ± 21 K，这与最近发现的它没有大气逆温相一致。我们的第一个凌日数据集相对于最佳拟合的光变曲线模型只有0.42毫等的散射，据我们所知，这是一个凌日系外行星系统的地面观测记录。
We present high-precision photometry of three transits of the extrasolar planetary system WASP-2, obtained by defocusing the telescopes, and achieving scatters of between 0.42 and 0.73 mmag versus the best-fitting model. These data are modelled using thejktebopcode, and taking into account the light from the recently discovered faint star close to the system. The physical properties of the WASP-2 system are derived using tabulated predictions from five different sets of stellar evolutionary models, allowing both statistical and systematic error bars to be specified. We find the mass and radius of the planet to beMb= 0.846 ± 0.055 ± 0.023MJupandRb= 1.043 ± 0.029 ± 0.015RJup. It has a low equilibrium temperature of 1281 ± 21 K, in agreement with a recent finding that it does not have an atmospheric temperature inversion. The first of our transit data sets has a scatter of only 0.42 mmag with respect to the best-fitting light-curve model, which to our knowledge is a record for ground-based observations of a transiting extrasolar planetary system.