Gaia22dkvLb：一颗可能可通过视向速度表征的微引力透镜行星
地球与行星天体物理
2024-05-31 v2 星系天体物理
天体物理仪器与方法
太阳与恒星天体物理
摘要
我们报告通过跟进 Gaia 预警的微引力透镜事件发现了一颗系外行星。事件 Gaia22dkv 指向盘源恒星，而非传统的核球微引力透镜场。我们的主要分析得出一颗木星质量行星，其 M_p = 0.59^{+0.15}_{-0.05} M_J，投影轨道间距 r_perp = 1.4^{+0.8}_{-0.3} AU，宿主为一颗距离约 1.3 kpc、约 1.1 M_sun 的转折星。在 r'~14 时，该宿主远比此前任何已发现的微引力透镜行星宿主明亮，为利用视向速度（RV）观测检验微引力透镜模型提供了机会。RV 数据可用于测量行星的轨道周期与偏心率，也能依 Kepler 与 RV 发现所推断的“内外相关性”搜寻该微引力透镜冷木星的内行星。此外，我们表明 Gaia 天体测量微引力透镜不仅可精确测量其角爱因斯坦半径 theta_E，还可直接测量微透镜视差矢量并无歧义地破除几何光变曲线简并，从而实现对透镜系统的确定性表征。
引用
@article{arxiv.2309.03944,
title = {Gaia22dkvLb: A Microlensing Planet Potentially Accessible to Radial-Velocity Characterization},
author = {Zexuan Wu and Subo Dong and Tuan Yi and Zhuokai Liu and Kareem El-Badry and Andrew Gould and L. Wyrzykowski and K. A. Rybicki and Etienne Bachelet and Grant W. Christie and L. de Almeida and L. A. G. Monard and J. McCormick and Tim Natusch and P. Zielinski and Huiling Chen and Yang Huang and Chang Liu and A. Merand and Przemek Mroz and Jinyi Shangguan and Andrzej Udalski and J. Woillez and Huawei Zhang and Franz-Josef Hambsch and P. J. Mikolajczyk and M. Gromadzki and M. Ratajczak and Katarzyna Kruszynska and N. Ihanec and Uliana Pylypenko and M. Sitek and K. Howil and Staszek Zola and Olga Michniewicz and Michal Zejmo and Fraser Lewis and Mateusz Bronikowski and Stephen Potter and Jan Andrzejewski and Jaroslav Merc and Rachel Street and Akihiko Fukui and R. Figuera Jaimes and V. Bozza and P. Rota and A. Cassan and M. Dominik and Y. Tsapras and M. Hundertmark and J. Wambsganss and K. Bakowska and A. Slowikowska},
journal= {arXiv preprint arXiv:2309.03944},
year = {2024}
}
备注
Accepted by AJ