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arXiv · 2107.06510

OGLE-2017-BLG-1434Lb: Confirmation of a Cold Super-Earth using Keck Adaptive Optics

J. W. Blackman·J. -P. Beaulieu·A. A. Cole·N. Koshimoto·A. Vandorou·A. Bhattacharya·J. -B. Marquette·D. P. Bennett
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Abstract

The microlensing event OGLE-2017-BLG-1434 features a cold super-Earth planet which is one of eleven microlensing planets with a planet-host star mass ratio $q < 1 \times 10^{-4}$. 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 $K_L = 16.96 \pm 0.11$ which most likely comes entirely from the lens star. Combining this with constraints from the large Einstein ring radius, $\theta_E=1.40 \pm 0.09\;mas$ and OGLE parallax we confirm this event as a super-Earth with mass $m_p = 4.43 \pm 0.25M_\odot$. This system lies at a distance of $D_L = 0.86 \pm 0.05\,kpc$ from Earth and the lens star has a mass of $M_L=0.234\pm0.012M_\odot$. We confirm that with a star-planet mass ratio of $q=0.57 \times 10^{-4}$, OGLE-2017-BLG-1434 lies near the inflexion point of the planet-host mass-ratio power law.

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J. W. Blackman, J. -P. Beaulieu, A. A. Cole, N. Koshimoto, A. Vandorou, A. Bhattacharya, J. -B. Marquette, D. P. Bennett. 2021-07-14. OGLE-2017-BLG-1434Lb: Confirmation of a Cold Super-Earth using Keck Adaptive Optics. https://doi.org/10.3847/1538-3881/abfda3

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