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arXiv · 2104.02079

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
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Abstract

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.

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R. Poleski, J. Skowron, P. Mróz, A. Udalski, M. K. Szymański, P. Pietrukowicz, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, M. Gromadzki. 2021-04-05. Wide-orbit exoplanets are common. Analysis of nearly 20 years of OGLE microlensing survey data. https://doi.org/10.32023/0001-5237/71.1.1

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