Wide-Orbit Exoplanets are Common. Analysis of Nearly 20 Years of OGLE Microlensing Survey Data
Abstract
We use nearly 20 yr 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 a.u. to ≈15 a.u. 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 under-predicts the number of wide-orbit planets. On average, every microlensing star hosts 1.4^(+0.9)_(-0.6) ice giant planets.
Additional Information
© 2021 Copernicus Foundation for Polish Astronomy. Received March 31, 2021. We would like to thank I. Soszyński, M. Kubiak, G. Pietrzyński, Ł. Wyrzykowski, M. Pawlak, and S. Kozłowski for their contribution to the collection of the OGLE photometric data. Work by RP was supported by Polish National Agency for Academic Exchange grant "Polish Returns 2019." The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to AU.Attached Files
Published - pap_71_1_1.pdf
Submitted - 2104.02079.pdf
Files
2104.02079.pdf
Additional details
Identifiers
- Eprint ID
- 109445
- Resolver ID
- CaltechAUTHORS:20210608-124209555
Related works
- Describes
- https://arxiv.org/abs/2104.02079 (URL)
Funding
- National Science Centre (Poland)
- MAESTRO 2014/14/A/ST9/00121
Dates
- Created
-
2021-06-09Created from EPrint's datestamp field
- Updated
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2021-06-09Created from EPrint's last_modified field