OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
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DOI：
10.3847/1538-3881/ab9ac3
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Y. Hirao;D. Bennett;Y. Ryu;N. Koshimoto;A. Udalski;J. Yee;T. Sumi;I. Bond;Y. Shvartzvald
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文献类型：
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作者：
Y. Hirao;D. Bennett;Y. Ryu;N. Koshimoto;A. Udalski;J. Yee;T. Sumi;I. Bond;Y. Shvartzvald
我们报告了行星微透镜事件OGLE-2017-BLG-0406的发现和分析，该事件是从地面和斯皮策卫星在太阳轨道上观测到的。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现象，并发现这是由行星透镜解释的，行星/宿主质量比从光变曲线模型中得出。仅地面和斯皮策“仅”数据各自对2D微透镜视差矢量提供非常强的一维（1D）约束。当结合在一起时，这些产生了一个精确的测量和主机和行星的质量Mplanet = 0.41 ± 0.05 MJup。该系统位于距离太阳5.2 ± 0.5 kpc处，根据透镜的运动学，宿主更可能是一颗星盘上的星星。行星与宿主的预计分离是（即，雪线的两倍以上）。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，盖亚源的自行测量遭受灾难性的10σ误差。
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 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 from the light-curve modeling. The ground-only and Spitzer-“only” data each provide very strong one-dimensional (1D) constraints on the 2D microlens parallax vector . When combined, these yield a precise measurement of and of the masses of the host and planet Mplanet = 0.41 ± 0.05 MJup. The system lies at a distance DL = 5.2 ± 0.5 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 (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 Gaia proper-motion measurement of the source suffers from a catastrophic 10σ error.