KMT-2019-BLG-1339L: an M Dwarf with a Giant Planet or a Companion Near the Planet/Brown Dwarf Boundary (2020)
We analyze KMT-2019-BLG-1339, a microlensing event with an obvious but incompletely resolved brief anomaly feature around the peak of the light curve. Although the origin of the anomaly is identified to be a companion to the lens with a low mass ratio q, the interpretation is subject to two different degeneracy types. The first type is the ambiguity in ρ, representing the angular source radius scaled to the angular radius of the Einstein ring, θE, and the other is the s ↔ s −1 degeneracy. The former type, ‘finite-source degeneracy’, causes ambiguities in both s and q, while the latter induces an ambiguity only in s. Here s denotes the separation (in units of θE) in projection between the lens components. We estimate that the lens components have masses (M1,M2) ∼ (0.27+0.36 −0.15 M⊙,11+16 −7 MJ) and ∼ (0.48+0.40 −0.28 M⊙,1.3 +1.1 −0.7 MJ) according to the two solutions subject to the finite-source degeneracy, indicating that the lens comprises an M dwarf and a companion with a mass around the planet/brown dwarf boundary or a Jovian-mass planet. It is possible to lift the finite-source degeneracy by conducting future observations utilizing a high resolution instrument because the relative lens-source proper motion predicted by the solutions are widely different.
CitationHan C, Kim D, Udalski A, Gould A, Albrow MD, Chung S-J, Hwang K-H, Jung YK, Lee C-U, Ryu Y-H, Shin I-G, Shvartzvald Y, Yee JC, Zang W, Cha S-M, Kim D-J, Kim H-W, Kim S-L, Lee D-J, Lee Y, Park B-G, Pogge RW, Mróz P, Szyma'nski MK, Skowron J, Poleski R, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Wrona M, Gromadzki M KMT-2019-BLG-1339L: an M Dwarf with a Giant Planet or a Companion Near the Planet/Brown Dwarf Boundary.
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KeywordsGravitational microlensing; Gravitational microlensing exoplanet detection (2147)
ANZSRC Fields of Research51 - Physical sciences::5101 - Astronomical sciences
RightsAll rights reserved unless otherwise stated
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