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


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, OGLE-2017-BLG-1434Lb: Confirmation of a cold super-Earth using Keck adaptive optics, The Astronomical Journal, 161, (6) Article 279. ISSN 1538-3881 (2021) [Refereed Article]

Copyright Statement

© 2021. The American Astronomical Society. All rights reserved.

DOI: doi:10.3847/1538-3881/abfda3


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 < 1 × 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 Details

Item Type:Refereed Article
Keywords:exoplanets, gravitational microlensing
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Blackman, JW (Mr Joshua Blackman)
UTAS Author:Beaulieu, J-P (Dr Jean-Philippe Beaulieu)
UTAS Author:Cole, AA (Associate Professor Andrew Cole)
UTAS Author:Vandorou, A ( Aikaterini Vandorou)
ID Code:144493
Year Published:2021
Funding Support:Australian Research Council (DP200101909)
Deposited By:Physics
Deposited On:2021-05-26
Last Modified:2021-06-03

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