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OGLE-2017-BLG-1434Lb: Confirmation of a cold super-Earth using Keck adaptive optics

Blackman, JW ORCID: 0000-0001-5860-1157, Beaulieu, J-P, Cole, AA ORCID: 0000-0003-0303-3855, Koshimoto, N, Vandorou, A, Bhattacharya, A, Marquette, J-B and Bennett, DP 2021 , 'OGLE-2017-BLG-1434Lb: Confirmation of a cold super-Earth using Keck adaptive optics' , The Astronomical Journal, vol. 161, no. 6 , pp. 1-7 , doi: 10.3847/1538-3881/abfda3.

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The microlensing event OGLE-2017-BLG-1434 features a cold super-Earth planet that is 1 of 11 microlensing planets with a planet–host-star mass ratio of q × 10−4. We provide an additional mass–distance constraint on the lens host using near-infrared adaptive optics photometry from Keck/NIRC2. We are able to determine a flux excess of KL = 16.96 ± 0.11, which most likely comes entirely from the lens star. Combining this with constraints from the large Einstein ring radius, θE = 1.40 ± 0.09 mas, and OGLE parallax we confirm this event as a super-Earth with a mass of mp = 4.43 ± 0.25M⊕. This system lies at a distance of DL = 0.86 ± 0.05 kpc from Earth and the lens star has a mass of ML = 0.234 ± 0.012M⊙. We confirm that with a star–planet mass ratio of q = 0.57 × 10-4, OGLE-2017-BLG-1434 lies near the inflexion point of the planet–host mass-ratio power law.

Item Type: Article
Authors/Creators:Blackman, JW and Beaulieu, J-P and Cole, AA and Koshimoto, N and Vandorou, A and Bhattacharya, A and Marquette, J-B and Bennett, DP
Keywords: exoplanets, gravitational microlensing
Journal or Publication Title: The Astronomical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 1538-3881
DOI / ID Number: 10.3847/1538-3881/abfda3
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© 2021. The American Astronomical Society. All rights reserved.

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