arXiv 2004.090672020-04astro-ph.EPastro-ph.GAastro-ph.SR

${\it Spitzer}$微透镜视差揭示土星质量行星在Galactic Disk内部绕M矮星运行

OGLE-2017-BLG-0406: ${\it Spitzer}$ Microlens Parallax Reveals Saturn-mass Planet orbiting M-dwarf Host in the Inner Galactic Disk

Yuki Hirao, David P. Bennett, Yoon-Hyun Ryu, Naoki Koshimoto, Andrzej Udalski, Jennifer C. Yee, Takahiro Sumi, Ian A. Bond, Yossi Shvartzvald, Fumio Abe, Richar… 展开作者

Yuki Hirao, David P. Bennett, Yoon-Hyun Ryu, Naoki Koshimoto, Andrzej Udalski, Jennifer C. Yee, Takahiro Sumi, Ian A. Bond, Yossi Shvartzvald, Fumio Abe, Richard K. Barry, Aparna Bhattacharya, Martin Donachie, Akihiko Fukui, Yoshitaka Itow, Iona Kondo, Man Cheung Alex Li, Yutaka Matsubara, Taro Matsuo, Shota Miyazaki, Yasushi Muraki, Masayuki Nagakane, Clement Ranc, Nicholas J. Rattenbury, Haruno Suematsu, Hiroshi Shibai, Daisuke Suzuki, Paul J. Tristram, Atsunori Yonehara, J. Skowron, R. Poleski, P. Mroz, M. K. Szymanski, I. Soszynski, S. Kozlowski, P. Pietrukowicz, K. Ulaczyk, K. Rybicki, P. Iwanek, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, In-Gu Shin, 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, Charles A. Beichman, Geoffery Bryden, Sebastiano Calchi Novati, Sean Carey, B. Scott Gaudi, Calen B. Henderson, Wei Zhu, Etienne Bachelet, Greg Bolt, Grant Christie, Markus Hundertmark, Tim Natusch, Dan Maoz, Jennie McCormick, Rachel A. Street, Thiam-Guan Tan, Yiannis Tsapras, U. G. Jorgensen, M. Dominik, V. Bozza, J. Skottfelt, C. Snodgrass, S. Ciceri, R. Figuera Jaimes, D. F. Evans, N. Peixinho, T. C. Hinse, M. J. Burgdorf, J. Southworth, S. Rahvar, S. Sajadian, M. Rabus, C. von Essen, Y. I. Fujii, J. Campbell-White, S. Lowry, C. Helling, L. Mancini, L. Haikala, Ryo Kandori

备注：: 40 pages, 12 figures, 10 tables, accepted for publication in The Astronomical Journal
DOI：: 10.3847/1538-3881/ab9ac3

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摘要：

我们报告了行星微透镜事件OGLE-2017-BLG-0406的发现和分析，该事件是从地面和太阳轨道上的${\it Spitzer}$卫星观测到的。在高放大率下，地面调查和后续小组密集地观察到光变曲线中的异常，并发现它是由行星透镜解释的，行星/主机质量比为$q=7.0 \times 10^{-4}$。仅地面数据和${\it Spitzer}$ -“仅”数据均对2-D微透镜视差矢量$\bf{π_{\rm E}}$提供非常强的一维（1-D）约束。当这些结合在一起时，可以精确测量出$\bf{π_{\rm E}}$，以及主行星$M_{\rm host}=0.56\pm0.07\,M_\odot$和行星$M_{\rm planet} = 0.41 \pm 0.05\,M_{\rm Jup}$的质量。该系统位于距离太阳$D_{\rm L}=5.2 \pm 0.5 \ {\rm kpc}$到银河系隆起的位置，根据透镜的运动学，宿主更可能是一颗盘状人口恒星。行星与宿主的投影分离是$a_{\perp} = 3.5 \pm 0.3 \ {\rm au}$，即，是雪线的两倍多银河系盘的运动学部分建立在基于OGLE-IV数据的源自行的精确测量上。相比之下，源的${\it Gaia}$自行测量遭受灾难性的$10\,σ$误差。

英文摘要：

We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the ${\it Spitzer}$ satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of $q=7.0 \times 10^{-4}$ from the light-curve modeling. The ground-only and ${\it Spitzer}$-"only" data each provide very strong one-dimensional (1-D) constraints on the 2-D microlens parallax vector $\bf{π_{\rm E}}$. When combined, these yield a precise measurement of $\bf{π_{\rm E}}$, and so of the masses of the host $M_{\rm host}=0.56\pm0.07\,M_\odot$ and planet $M_{\rm planet} = 0.41 \pm 0.05\,M_{\rm Jup}$. The system lies at a distance $D_{\rm L}=5.2 \pm 0.5 \ {\rm kpc}$ from the Sun toward the Galactic bulge, and the host is more likely to be a disk population star according to the kinematics of the lens. The projected separation of the planet from the host is $a_{\perp} = 3.5 \pm 0.3 \ {\rm au}$, i.e., just over twice the snow line. The Galactic-disk kinematics are established in part from a precise measurement of the source proper motion based on OGLE-IV data. By contrast, the ${\it Gaia}$ proper-motion measurement of the source suffers from a catastrophic $10\,σ$ error.

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