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arXiv 1907.01741astro-ph.EP
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OGLE-2018-BLG-1011L \lowercase{b,c}:两颗巨行星绕低质量恒星运行的微透镜行星系

OGLE-2018-BLG-1011L\lowercase{b,c}: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star

Cheongho Han, David P. Bennett, Andrzej Udalski, Andrew Gould, Ian A. Bond, Yossi Shvartzvald, Kay-Sebastian Nikolaus, Markus Hundertmark, Valerio Bozza, Arnaud… 展开作者

Cheongho Han, David P. Bennett, Andrzej Udalski, Andrew Gould, Ian A. Bond, Yossi Shvartzvald, Kay-Sebastian Nikolaus, Markus Hundertmark, Valerio Bozza, Arnaud Cassan, Yuki Hirao, Etienne Bachelet, Michael D. Albrow, Sun-Ju Chung, Kyeongsoo Hong, Kyu-Ha Hwang, Chung-Uk Lee, Yoon-Hyun Ryu, In-Gu Shin, Jennifer C. Yee, Youn Kil Jung, Sang-Mok Cha, Doeon Kim, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge Przemek Mróz, Michał K. Szymański, Jan Skowron, Radek Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona Fumio Abe, Richard Barry, Aparna Bhattacharya, Martin Donachie, Akihiko Fukui, Yoshitaka Itow, Kohei Kawasaki, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Masayuki Nagakane, Clément Ranc, Nicholas J. Rattenbury, Haruno Suematsu, Denis J. Sullivan Takahiro Sumi, Daisuke Suzuki, Paul J. Tristram, Atsunori Yonehara, Pascal Fouqué, Shude Mao, Tianshu Wang, Weicheng Zang, Wei Zhu, Matthew T. Penny, Charles A. Beichman, Geoffery Bryden, Sebastiano Calchi Novati, B. Scott Gaudi, Calen B. Henderson, Savannah Jacklin, Keivan G. Stassun

摘要:

我们报告了一个从微透镜事件OGLE-2018-BLG-1011的分析中发现的多行星系统,其光变曲线在峰值附近呈现出双凸异常。我们发现,异常不能完全解释的二元透镜或二元源的解释和它的描述需要引入一个额外的镜头组件。3L 1 S(3个透镜组件和一个源)模型产生了三组解,其中一组解表明透镜是一个双星系统中的行星系,而另外两组解表明透镜是一个多行星系统。通过研究各个模型与详细的光变曲线结构的拟合,我们发现具有行星与宿主质量比$\sim 9.5\times 10^{-3}$和$\sim 15\times 10^{-3}$的多行星解决方案优于其他解决方案。从贝叶斯分析,我们发现,该透镜是由两个行星的质量$1.8^{+3..4}_{-1.1}~M_{\rm J}$和$2.8^{+5.1}_{-1.7}~M_{\rm J}$周围的主机质量$0.18^{+0.33}_{-0.10}~M_\odot$和距离$7.1^{+1.1}_{-1.5}~{\rm kpc}$。估计的距离表明,透镜是已知的多行星系统中最远的系统。投影的行星与宿主的距离分别是$a_{\perp,2}=1.8^{+2.1}_{-1.5}~{\rm au}$($0.8^{+0.9}_{-0.6}~{\rm au}$)和$a_{\perp,3}=0.8^{+0.9}_{-0.6}~{\rm au}$,括号内和括号外的$a_{\perp,2}$值是对应于两个简并解的距离,表明两颗行星都位于宿主雪线之外,就像之前通过微透镜发现的其他四个多行星系统一样。

英文摘要:

We report a multiplanetary system found from the analysis of microlensing event OGLE-2018-BLG-1011, for which the light curve exhibits a double-bump anomaly around the peak. We find that the anomaly cannot be fully explained by the binary-lens or binary-source interpretations and its description requires the introduction of an additional lens component. The 3L1S (3 lens components and a single source) modeling yields three sets of solutions, in which one set of solutions indicates that the lens is a planetary system in a binary, while the other two sets imply that the lens is a multiplanetary system. By investigating the fits of the individual models to the detailed light curve structure, we find that the multiple-planet solution with planet-to-host mass ratios $\sim 9.5\times 10^{-3}$ and $\sim 15\times 10^{-3}$ are favored over the other solutions. From the Bayesian analysis, we find that the lens is composed of two planets with masses $1.8^{+3..4}_{-1.1}~M_{\rm J}$ and $2.8^{+5.1}_{-1.7}~M_{\rm J}$ around a host with a mass $0.18^{+0.33}_{-0.10}~M_\odot$ and located at a distance $7.1^{+1.1}_{-1.5}~{\rm kpc}$. The estimated distance indicates that the lens is the farthest system among the known multiplanetary systems. The projected planet-host separations are $a_{\perp,2}=1.8^{+2.1}_{-1.5}~{\rm au}$ ($0.8^{+0.9}_{-0.6}~{\rm au}$) and $a_{\perp,3}=0.8^{+0.9}_{-0.6}~{\rm au}$, where the values of $a_{\perp,2}$ in and out the parenthesis are the separations corresponding to the two degenerate solutions, indicating that both planets are located beyond the snow line of the host, as with the other four multiplanetary systems previously found by microlensing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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