KMT-2018-BLG-0029Lb: A Very Low Mass-Ratio Spitzer Microlens Planet

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Journal Article
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Date
2019
Authors
Gould A
Ryu Y-H
Novati SC
Zang W
Albrow MD
Chung S-J
Han C
Hwang K-H
Jung YK
Shin I-G
Abstract

At q=1.81±0.20×10−5, 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 ×10−5. The event was observed by {\it Spitzer}, yielding a microlens-parallax πE measurement. Combined with a measurement of the Einstein radius θE from finite-source effects during the caustic crossings, these measurements imply masses of the host Mhost=1.14−0.12+0.10M⊙ and planet Mplanet=7.59−0.69+0.75M⊕, system distance DL=3.38−0.26+0.22kpc and projected separation a⊥=4.27−0.23+0.21au. 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.

Description
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.
Keywords
astro-ph.EP, gravitational microlensing: micro, planetary systems
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510107 - Planetary science (excl. solar system and planetary geology)
Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
Fields of Research::51 - Physical sciences::5101 - Astronomical sciences::510104 - Galactic astronomy
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