OGLE-2017-BLG-0482Lb:一颗环绕低质量宿主恒星的微引力透镜超级地球
地球与行星天体物理
2018-05-02 v1
摘要
我们报告发现了一个行星系统,其中一颗超级地球环绕一颗晚型M矮星宿主。该行星系统通过对微引力透镜事件 OGLE-2017-BLG-0482 的分析发现,其中行星信号表现为宿主产生的平滑透镜光变曲线上的短期异常。尽管信号微弱且持续时间短,该行星信号仍由三个微引力透镜巡天的密集连续覆盖而得到可靠探测。我们发现行星/宿主质量比为 。我们从观测到的透镜光变曲线中的长期偏离测量了微透镜视差 ,但角爱因斯坦半径 无法测量,因为源轨迹未穿过行星引起的焦散。利用测得的事件时标和微透镜视差,我们发现行星和宿主的质量分别为 和 ,它们之间的投影分离为 au。估计的透镜距离为 kpc。该行星系统的发现表明微引力透镜提供了一种探测环绕低质量恒星的低质量行星的重要方法。
引用
@article{arxiv.1803.10830,
title = {OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star},
author = {C. Han and Y. Hirao and A. Udalski and C. -U. Lee and V. Bozza and A. Gould and F. Abe and R. Barry and I. A. Bond and D. P. Bennett and A. Bhattacharya and M. Donachie and P. Evans and A. Fukui and Y. Itow and K. Kawasaki and N. Koshimoto and M. C. A. Li and C. H. Ling and Y. Matsubara and S. Miyazaki and H. Munakata and Y. Muraki and M. Nagakane and K. Ohnishi and C. Ranc and N. Rattenbury and T. Saito and A. Sharan and D. J. Sullivan and T. Sumi and D. Suzuki and P. J. Tristram and T. Yamada and A. Yonehara and P. Mróz and R. Poleski and S. Kozłowski and I. Soszyński and P. Pietrukowicz and J. Skowron and M. K. Szymańsk and K. Ulaczyk and M. Pawlak and K. Rybicki and P. Iwanek and M. D. Albrow and S. -J. Chung and K. -H. Hwang and Y. K. Jung and D. Kim and W. -T. Kim and H. -W. Kim and Y. -H. Ryu and I. -G. Shin and Y. Shvartzvald and J. C. Yee and W. Zhu and S. -M. Cha and S. -L. Kim and D. -J. Kim and D. -J. Lee and Y. Lee and B. -G. Park and R. W. Pogge},
journal= {arXiv preprint arXiv:1803.10830},
year = {2018}
}
备注
10 pages, 10 figures, 2 tables