KMT-2018-BLG-0029Lb: A Very Low Mass-Ratio Spitzer Microlens Planet (2019)
Authors
Alternative Title
A Very Low Mass-Ratio Spitzer Microlens PlanetAbstract
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 {\it Spitzer}, yielding a microlens-parallax $\pi_{\rm E}$ measurement. Combined with a measurement of the Einstein radius $\theta_{\rm E}$ from finite-source effects during the caustic crossings, these measurements imply masses of the host $M_{\rm host}=1.14^{+0.10}_{-0.12}\, M_\odot$ and planet $M_{\rm planet} = 7.59^{+0.75}_{-0.69}\,M_\oplus$, system distance $D_L = 3.38^{+0.22}_{-0.26}\,\,{\rm kpc}$ and projected separation $a_\perp = 4.27^{+0.21}_{-0.23}\,{\rm au}$. The blended light, which is substantially brighter than the microlensed source, is plausibly due to the lens and could be observed at high resolution immediately.
Citation
Gould A, Ryu Y-H, Novati SC, Zang W, Albrow MD, Chung S-J, Han C, Hwang K-H, Jung YK, Shin I-G, Shvartzvald Y, Yee JC, Cha S-M, Kim D-J, Kim H-W, Kim S-L, Lee C-U, Lee D-J, Lee Y, Park B-G, Pogge RW, Beichman C, Bryden G, Carey S, Gaudi BS, Henderson CB, Zhu W, Fouqué P, Penny MT, Petric A, Burdullis T, Mao S KMT-2018-BLG-0029Lb: A Very Low Mass-Ratio Spitzer Microlens Planet.This citation is automatically generated and may be unreliable. Use as a guide only.
Keywords
astro-ph.EP; gravitational microlensing: micro; planetary systemsANZSRC Fields of Research
51 - Physical sciences::5101 - Astronomical sciences::510107 - Planetary science (excl. solar system and planetary geology)51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
51 - Physical sciences::5101 - Astronomical sciences::510104 - Galactic astronomy
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