OGLE-2017-BLG-1049: Another giant planet microlensing event

We report the discovery of a giant exoplanet in the microlensing event OGLE-2017-BLG-1049, with a planet–host star mass ratio of q = 9.53 ± 0.39 × 10−3 and a caustic crossing feature in Korea Microlensing Telescope Network (KMTNet) observations. The caustic crossing feature yields an angular Einstein radius of θE = 0.52 ± 0.11 mas. However, the microlens parallax is not measured because the time scale of the event, tE ≃ 29 days, is too short. Thus, we perform a Bayesian analysis to estimate physical quantities of the lens system. We find that the lens system has a star with mass Mh = 0.55+0.36−0.29M⊙ hosting a giant planet with Mp = 5.53+3.62 −2.87MJup, at a distance of DL = 5.67+1.11−1.52 kpc. The projected star–planet separation is a⊥ = 3.92+1.10−1.32 au. This means that the planet is located beyond the snow line of the host. The relative lens–source proper motion is µrel ∼ 7 mas yr−1, thus the lens and source will be separated from each other within 10 years. After this, it will be possible to measure the flux of the host star with 30 meter class telescopes and to determine its mass.

Keywords

gravitational lensing, micro

Citation

Kim YH, Chung SJ, Udalski A, Bond IA, Jung YK, Gould A, Albrow MD, Han C, Hwang KH, Ryu YH, Shin IG, Shvartzvald Y, Yee JC, Zang W, Cha SM, Kim DJ, Kim HW, Kim SL, Lee CU, Lee DJ, Lee Y, Park BG, Pogge RW, Poleski R, Mróz P, Skowron J, Szymański MK, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Abe F, Barry R, Bennett DP, Bhattacharya A, Donachie M, Fujii H, Fukui A, Itow Y, Hirao Y, Kirikawa R, Kondo I, Koshimoto N, Matsubara Y, Muraki Y, Miyazaki S, Ranc C, Rattenbury NJ, Satoh Y, Shoji H, Sumi T, Suzuki D, Tristram PJ, Tanaka Y, Yamawaki T, Yonehara A. (2020). OGLE-2017-BLG-1049: Another giant planet microlensing event. Journal of the Korean Astronomical Society. 53. 6. (pp. 161-168).

URI

https://mro.massey.ac.nz/handle/10179/69183

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