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arXiv 2104.02079astro-ph.EPastro-ph.GAastro-ph.SR
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宽轨道系外行星很常见。近20年OGLE微透镜测量数据分析

Wide-orbit exoplanets are common. Analysis of nearly 20 years of OGLE microlensing survey data

R. Poleski, J. Skowron, P. Mróz, A. Udalski, M. K. Szymański, P. Pietrukowicz, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, M. Gromadzki

摘要:

我们利用OGLE巡天获得的近20年的测光数据来测量宽轨道(或冰巨星)微透镜行星的出现率,即,分离度为~5 AU至~15 AU,质量比为$10^{-4}$至0.033。在3112个事件的样本中,我们发现了6个以前已知的宽轨道行星和一个新的微透镜行星或褐矮星OGLE-2017-BLG-0114 Lb,对于它们来说,近距离和宽轨道是可能的,近距离轨道是首选。我们运行广泛的模拟的行星检测效率,稳健地考虑到有限源的影响。我们发现,以前测得的微透镜行星率的外推显着低估了宽轨道行星的数量。平均而言,每颗微透镜恒星都拥有$1.4^{+0.9}_{-0.6}$冰巨行星。

英文摘要:

We use nearly 20 years of photometry obtained by the OGLE survey to measure the occurrence rate of wide-orbit (or ice giant) microlensing planets, i.e., with separations from ~5 AU to ~15 AU and mass-ratios from $10^{-4}$ to 0.033. In a sample of 3112 events we find six previously known wide-orbit planets and a new microlensing planet or brown dwarf OGLE-2017-BLG-0114Lb, for which close and wide orbits are possible and close orbit is preferred. We run extensive simulations of the planet detection efficiency, robustly taking into account the finite-source effects. We find that the extrapolation of the previously measured rate of microlensing planets significantly underpredicts the number of wide-orbit planets. On average, every microlensing star hosts $1.4^{+0.9}_{-0.6}$ ice giant planets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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