arXiv 2102.114632021-02-25astro-ph.EPastro-ph.GA

OGLE-2018-BLG-1428 Lb：一颗超越矮星雪线的行星

OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star

Yun-Hak Kim, Sun-Ju Chung, Andrej Udalski, Andrew Gould, Michael D. Albrow, Youn Kil Jung, Kyu-Ha Hwang, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Jennifer C. Ye… 展开作者

Yun-Hak Kim, Sun-Ju Chung, Andrej Udalski, Andrew Gould, Michael D. Albrow, Youn Kil Jung, Kyu-Ha Hwang, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Jennifer C. Yee, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Przemek Mróz, Radek Poleski, Marcin Wrona, Patryk Iwanek, Michał K. Szymański, Jan Skowron, Igor Soszyński, Szymon Kozłowski, Paweł Pietrukowicz, Krzysztof Ulaczyk, Krzysztof Rybicki

备注：: 12 pages, 6 figures, accepted in MNRAS
DOI：: 10.1093/mnras/stab534

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摘要：

我们对微透镜事件OGLE-2018-BLG-1428进行了分析，该事件具有短持续时间（$\sim 1$天）的焦散交叉异常。该事件是由行星透镜系统引起的，行星/宿主质量比为$q=1.7\times10^{-3}$。由于检测到的焦散线交叉异常，有限源的效果得到了很好的测量，但由于相对较短的时间尺度（$t_{\rm E}=24$天），微透镜视差不受约束。通过贝叶斯分析，我们发现主星是一颗距离为$D_{\rm L}=6.22^{+1.03}_{-1.51}\ {\rm kpc}$的矮星$M_{\rm host}=0.43^{+0.33}_{-0.22} \ M_{\odot}$，而行星是一颗木星质量的行星$M_{\rm p}=0.77^{+0.77}_{-0.53} \ M_{\rm J}$，其投影距离为$a_{\perp}=3.30^{+0.59}_{-0.83}\ {\rm au}$。这颗行星的轨道超出了主星的雪线。考虑到$μ_{\rm rel} = 5.58 \pm 0.38\ \rm mas\ yr^{-1}$的透镜-光源相对自行，未来可以在30米望远镜上用自适应光学解决透镜问题。

英文摘要：

We present the analysis of the microlensing event OGLE-2018-BLG-1428, which has a short-duration ($\sim 1$ day) caustic-crossing anomaly. The event was caused by a planetary lens system with planet/host mass ratio $q=1.7\times10^{-3}$. Thanks to 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 timescale ($t_{\rm E}=24$ days). From a Bayesian analysis, we find that the host star is a dwarf star $M_{\rm host}=0.43^{+0.33}_{-0.22} \ M_{\odot}$ 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 $μ_{\rm rel} = 5.58 \pm 0.38\ \rm mas\ yr^{-1}$, the lens can be resolved by adaptive optics with a 30m telescope in the future.

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