OGLE-2019-BLG-0362Lb: A super-Jovian-mass planet around a low-mass star

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Sun-Ju Chung Jennifer C. Yee Andrej Udalski Andrew Gould Michael D. Albrow Youn Kil Jung Kyu-Ha Hwang Cheongho Han Yoon-Hyun Ryu In-Gu Shin Yossi Shvartzvald Weicheng Zang Sang-Mok Cha Dong-Jin Kim Seung-Lee Kim Chung-Uk Lee Dong-Joo Lee Yongseok Lee Byeong-Gon Park Richard W. Pogge

摘要： We present the analysis of a planetary microlensing event OGLE-2019-BLG-0362 with a short-duration anomaly $(\sim 0.4\, \rm days)$ near the peak of the light curve, which is caused by the resonant caustic. The event has a severe degeneracy with $\Delta \chi^2 = 0.9$ between the close and the wide binary lens models both with planet-host mass ratio $q \simeq 0.007$. We measure the angular Einstein radius but not the microlens parallax, and thus we perform a Bayesian analysis to estimate the physical parameters of the lens. We find that the OGLE-2019-BLG-0362L system is a super-Jovian-mass planet $M_{\rm p}=3.26^{+0.83}_{-0.58}\, M_{\rm J}$ orbiting an M dwarf $M_{\rm h}=0.42^{+0.34}_{-0.23}\, M_\odot$ at a distance $D_{\rm L} =5.83^{+1.04}_{-1.55}\, \rm kpc$. The projected star-planet separation is $a_{\perp} = 2.18^{+0.58}_{-0.72}\, \rm AU$, which indicates that the planet lies beyond the snow line of the host star.

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