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arXiv 1602.02519astro-ph.EP
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六年微透镜观测(2003 - 2008)的OGLE-III行星探测效率

The OGLE-III planet detection efficiency from six years of microlensing observations (2003 to 2008)

Y. Tsapras, M. Hundertmark, Ł. Wyrzykowski, K. Horne, A. Udalski, C. Snodgrass, R. Street, D. M. Bramich, M. Dominik, V. Bozza, R. Figuera Jaimes, N. Kains, J. … 展开作者

Y. Tsapras, M. Hundertmark, Ł. Wyrzykowski, K. Horne, A. Udalski, C. Snodgrass, R. Street, D. M. Bramich, M. Dominik, V. Bozza, R. Figuera Jaimes, N. Kains, J. Skowron, M. K. Szymański, G. Pietrzyński, I. Soszyński, K. Ulaczyk, S. Kozłowski, P. Pietrukowicz, R. Poleski

摘要:

我们使用六年(2003年至2008年)的光学引力透镜实验III微透镜观测,以获得一系列的行星质量和投影距离的主恒星的调查检测效率。我们对微透镜光变曲线进行了独立的分析,以提取事件参数并计算给定数据的行星检测概率。2433条光变曲线符合我们的质量选择标准,并保留以供进一步加工。探测范围内探测概率的总和产生了预期的微透镜行星探测数量。我们采用银河系模型将这种分布从无量纲转换为物理单位α/au和M_E。对小行星的调查灵敏度在1到4 au的范围内最高,对于更大质量的行星,则会转向稍大的分离。

英文摘要:

We use six years (2003 to 2008) of Optical Gravitational Lensing Experiment III microlensing observations to derive the survey detection efficiency for a range of planetary masses and projected distances from the host star. We perform an independent analysis of the microlensing light curves to extract the event parameters and compute the planet detection probability given the data. 2433 light curves satisfy our quality selection criteria and are retained for further processing. The aggregate of the detection probabilities over the range explored yields the expected number of microlensing planet detections. We employ a Galactic model to convert this distribution from dimensionless to physical units, α/au and M_E. The survey sensitivity to small planets is highest in the range 1 to 4 au, shifting to slightly larger separations for more massive ones.

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