http://arxiv.org/abs/1906.11183
At $q=1.81\pm 0.20 \times 10^{-5}$, KMT-2018-BLG-0029Lb has the lowest planet-host mass ratio $q$ of any microlensing planet to date by more than a factor of two. Hence, it is the first planet that probes below the apparent “pile-up” at $q=5$–10 $\times 10^{-5}$. The event was observed by Spitzer, yielding a microlens-parallax $\pi_E$ measurement. Combined with a measurement of the Einstein radius $\theta_E$ from finite-source effects during the caustic crossings, these measurements imply masses of the host $M_{\rm host}=1.06^{+0.20}{-0.17}\, M\odot$ and planet $M_{\rm planet} = 6.41^{+0.89}{-0.75}\,M\oplus$, system distance $D_L = 2.73^{+0.26}{-0.22}\,\,kpc$ and projected separation $a\perp = 3.94^{+0.35}_{-0.31}\,AU$.
A. Gould, Y. Ryu, S. Novati, et. al.
Thu, 27 Jun 19
34/62
Comments: 13 pages, 6 Figures, submitted to JKAS
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