arXiv 2003.029832020-03astro-ph.EPastro-ph.GAastro-ph.SR

Ogle-2018-blg-0677lb：银河系凸起附近的超级地球

Ogle-2018-blg-0677lb: A super earth near the galactic bulge

Antonio Herrera-Martín, M. D. Albrow, A. Udalski, A. Gould, Y. -H. Ryu, J. C. Yee, S. -J. Chung, C. Han, K. -H. Hwang, Y. K. Jung, C. -U. Lee, I. -G. Shin, Y. S… 展开作者

Antonio Herrera-Martín, M. D. Albrow, A. Udalski, A. Gould, Y. -H. Ryu, J. C. Yee, S. -J. Chung, C. Han, K. -H. Hwang, Y. K. Jung, C. -U. Lee, I. -G. Shin, Y. Shvartzvald, W. Zang, S. -M. Cha, D. -J. Kim, H. -W. Kim, S. -L. Kim, D. -J. Lee, Y. Lee, B. -G. Park, R. W. Pogge, M. K. Szymański, P. Mróz, J. Skowron, R. Poleski, I. Soszyński, S. Kozłowski, P. Pietrukowicz, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona

备注：: 15 page, 12 figures, Published in AJ
发表信息：: AJ 159 (2020) 6
DOI：: 10.3847/1538-3881/ab893e

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摘要：

我们报告了微透镜事件OGLE-2018-BLG-0677的分析。这一事件的光变曲线中的一个小特征导致发现透镜是一个恒星-行星系统。虽然有两个退化的解决方案，无法区分这一事件，都导致类似的行星主机质量比。我们进行贝叶斯分析的基础上的银河系模型，以获得系统的属性，并发现该行星对应于一个超级地球/次海王星的质量$M_{\mathrm{planet}} = {3.96}^{+5.88}_{-2.66}\mathrm{M_\oplus}$。主恒星的质量为$ M_{\mathrm{host}} = {0.12}^{+0.14}_{-0.08}\mathrm{M_\odot}$。内、外解的投影距离分别为${0.63}^{+0.20}_{-0.17}$~AU和${0.72}^{+0.23}_{-0.19}$~AU。在$Δχ^2=χ^2({\rm 1L1S})-χ^2({\rm 2L1S})=46$，这是迄今为止所有被探测到的微透镜行星中最低的$Δχ^2$，这一特征与它主要通过"下降"而不是"凸起"被探测到的事实密切相关。

英文摘要：

We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star-planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass $M_{\mathrm{planet}} = {3.96}^{+5.88}_{-2.66}\mathrm{M_\oplus}$. The host star has a mass $ M_{\mathrm{host}} = {0.12}^{+0.14}_{-0.08}\mathrm{M_\odot}$. The projected separation for the inner and outer solutions are ${0.63}^{+0.20}_{-0.17}$~AU and ${0.72}^{+0.23}_{-0.19}$~AU respectively. At $Δχ^2=χ^2({\rm 1L1S})-χ^2({\rm 2L1S})=46$, this is by far the lowest $Δχ^2$ for any securely-detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a "dip" rather than a "bump".

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