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

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, ${\theta }_E=1.40\pm 0.09mas$ 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 $D_L=0.86\pm 0.05kpc$ from Earth and the lens star has a mass of $M_L=0.234\pm 0.012M_{\odot }$. 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.

arXiv comment7 pages, 4 figures

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