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Systematic KMTNet planetary anomaly search. I. OGLE-2019-BLG-1053Lb, a buried terrestrial planet
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OGLE Collaboration (Including: Ulaczyk, Krzysztof). (2021) Systematic KMTNet planetary anomaly search. I. OGLE-2019-BLG-1053Lb, a buried terrestrial planet. The Astronomical Journal, 162 (4). 163. doi:10.3847/1538-3881/ac12d4 ISSN 0004-6256.
An open access version can be found in:
Official URL: https://doi.org/10.3847/1538-3881/ac12d4
Abstract
In order to exhume the buried signatures of "missing planetary caustics" in Korea Microlensing Telescope Network (KMTNet) data, we conducted a systematic anomaly search of the residuals from point-source point-lens fits, based on a modified version of the KMTNet EventFinder algorithm. This search revealed the lowest-mass-ratio planetary caustic to date in the microlensing event OGLE-2019-BLG-1053, for which the planetary signal had not been noticed before. The planetary system has a planet–host mass ratio of q = (1.25 ± 0.13) × 10−5. A Bayesian analysis yielded estimates of the mass of the host star, ${M}_{\mathrm{host}}={0.61}_{-0.24}^{+0.29}\,{M}_{\odot }$, the mass of its planet, ${M}_{\mathrm{planet}}={2.48}_{-0.98}^{+1.19}\,{M}_{\oplus }$, the projected planet–host separation, ${a}_{\perp }={3.4}_{-0.5}^{+0.5}$ au, and the lens distance, ${D}_{{\rm{L}}}={6.8}_{-0.9}^{+0.6}$ kpc. The discovery of this very-low-mass-ratio planet illustrates the utility of our method and opens a new window for a large and homogeneous sample to study the microlensing planet–host mass ratio function down to q ∼ 10−5.
Item Type: | Journal Article | |||||||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Journal or Publication Title: | The Astronomical Journal | |||||||||||||||
Publisher: | Institute of Physics Publishing, Inc. | |||||||||||||||
ISSN: | 0004-6256 | |||||||||||||||
Official Date: | 24 September 2021 | |||||||||||||||
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Volume: | 162 | |||||||||||||||
Number: | 4 | |||||||||||||||
Article Number: | 163 | |||||||||||||||
DOI: | 10.3847/1538-3881/ac12d4 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Copyright Holders: | © 2021. The American Astronomical Society. All rights reserved. | |||||||||||||||
Open Access Version: | ||||||||||||||||
Contributors: |
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