OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star. Issue 2 (25th February 2021)

• Record Type: Journal Article
• Authors: Kim, Yun Hak; Chung, Sun-Ju; Udalski, Andrej; Gould, Andrew; Albrow, Michael D; Jung, Youn Kil; Hwang, Kyu-Ha; Han, Cheongho; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Yee, Jennifer C; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W; Mróz, Przemek; Poleski, Radek; Wrona, Marcin; Iwanek, Patryk; Szymański, Michał K; Skowron, Jan; Soszyński, Igor; Kozłowski, Szymon; Pietrukowicz, Paweł; Ulaczyk, Krzysztof; Rybicki, Krzysztof;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 503:Issue 2(2021)
• Page Start: 2706
• Page End: 2712
• Publication Date: 2021-02-25
• Subjects: gravitational lensing: micro -- planets and satellites: detection; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab534
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present the analysis of the microlensing event OGLE-2018-BLG-1428, which has a short-duration (∼1 d) caustic-crossing anomaly. The event was caused by a planetary lens system with planet/host mass ratio q = 1.7 × 10 −3 . Because of the detection of the caustic-crossing anomaly, the finite source effect was well measured, but the microlens parallax was not constrained due to the relatively short time-scale ( t E = 24 d). From a Bayesian analysis, we find that the host star is a dwarf star $M_{\rm host}=0.43^{+0.33}_{-0.22} \ \mathrm{M}_{\odot }$ at a distance $D_{\rm L}=6.22^{+1.03}_{-1.51}\ {\rm kpc}$ and the planet is a Jovian-mass planet $M_{\rm p}=0.77^{+0.77}_{-0.53} \ M_{\rm J}$ with a projected separation $a_{\perp }=3.30^{+0.59}_{-0.83}\ {\rm au}$ . The planet orbits beyond the snow line of the host star. Considering the relative lens-source proper motion of $\mu _{\rm rel} = 5.58 \pm 0.38\ \rm mas\ yr^{-1}$, the lens can be resolved by adaptive optics with a 30 m telescope in the future.