Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations
Full characterization of binary-lens event OGLE-2002-BLG-069 from PLANET observations
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来自 PLANET 观测的双透镜事件 OGLE-2002-BLG-069 的完整表征
DOI：
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发表时间：
2005
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影响因子：
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通讯作者：
C. Thurl
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作者：
D. Kubas;A. Cassan;J. Beaulieu;C. Coutures;C. Coutures;M. Dominik;M. Albrow;S. Brillant;J. Caldwell;D. Dominis;J. Donatowicz;C. Fendt;P. Fouqué;U. Jørgensen;J. Greenhill;K. Hill;J. Heinmüller;K. Horne;S. R. Kane;J. Marquette;R. Martin;J. Menzies;K. Pollard;K. Sahu;C. Vinter;J. Wambsganss;R. Watson;A. Williams;C. Thurl
我们分析了由PLANET和OGLE获得的焦散交叉双透镜微透镜事件OGLE-2002-BLG-069的光度数据。由于出色的光度和光谱覆盖的事件，我们能够约束的透镜模型之间的密切和广泛的二元透镜的已知的模糊性。年视差的检测结合扩展源效应的测量，使我们能够确定竞争模型的透镜组件的质量，距离和速度。虽然包含近距离双星透镜的模型导致了一个膨胀盘透镜方案，其透镜质量为M=（0.51 +-0.15）M_sol，距离D_L=（2.9 +-0.4）kpc，但宽距离双星透镜方案需要一个相当不可信的双星黑洞透镜（M >=126 M_sol）。此外，我们比较了目前最先进的数值和经验模型的源，一个G5 III隆起巨人的表面亮度分布。我们发现，一个线性的边缘变暗模型的源星星的大气是一致的数据，而PHOENIX大气模型假设LTE和没有自由参数不匹配我们的观察。
We analyze the photometric data obtained by PLANET and OGLE on the caustic-crossing binary-lens microlensing event OGLE-2002-BLG-069. Thanks to the excellent photometric and spectroscopic coverage of the event, we are able to constrain the lens model up to the known ambiguity between close and wide binary lenses. The detection of annual parallax in combination with measurements of extended-source effects allows us to determine the mass, distance and velocity of the lens components for the competing models. While the model involving a close binary lens leads to a Bulge-Disc lens scenario with a lens mass of M=(0.51 +- 0.15) M_sol and distance of D_L=(2.9 +- 0.4) kpc, the wide binary lens solution requires a rather implausible binary black-hole lens (M >=126 M_sol). Furthermore we compare current state-of-the-art numerical and empirical models for the surface brightness profile of the source, a G5III Bulge giant. We find that a linear limb-darkening model for the atmosphere of the source star is consistent with the data whereas a PHOENIX atmosphere model assuming LTE and with no free parameter does not match our observations.