论文标题
在2016年和2017赛季数据中确定的四个带有微弱源恒星的微透明行星
Four Microlensing Planets with Faint-source Stars Identified in the 2016 and 2017 Season Data
论文作者
论文摘要
由于信号较弱，发生在淡淡的源星上的微透明行星可以逃脱检测。有时，由于难以在检测到的行星上提取备受瞩目的科学问题，因此未报告对此类行星的检测。对于基于完整样本的微透明行星系统的可靠人口统计学，我们研究了在2016年和2017年季节获得的微透明数据，以在微弱的源镜头事件中搜索行星信号。从这项调查中，我们发现了四个未发表的微透镜行星，包括KMT-2016-BLG-2364LB，KMT-2016-BLG-2397LB，OGLE-2017-BLG-0604LB和OGLE-2017-BLG-1375LB。我们分析了观察到的镜头曲线并确定其镜头参数。从测量参数的约束进行的贝叶斯分析中，发现宿主和行星的质量在范围内$ 0.50 \ sillsim m _ {\ rm host}/m_ \ odot \ odot \ odot \ odot \ lisesim 0.85 $ 0.85 $和$ 0.5 \ \ \ \ \ \ \ \ silysm _} 13.2 $分别表明所有行星都是围绕具有亚质量的寄主恒星周围的巨型行星。镜头位于$ 3.8 \ lyssim \ dl/{\ rm kpc} \ lysesim 6.4 $的距离范围内。发现OGLE-2017-BLG-0604和OGLE-2017-BLG-1375的透镜可能在银河磁盘中。
Microlensing planets occurring on faint source stars can escape detection due to their weak signals. Occasionally, detections of such planets are not reported due to the difficulty of extracting high-profile scientific issues on the detected planets. For the solid demographic census of microlensing planetary systems based on a complete sample, we investigate the microlensing data obtained in the 2016 and 2017 seasons to search for planetary signals in faint-source lensing events. From this investigation, we find four unpublished microlensing planets including KMT-2016-BLG-2364Lb, KMT-2016-BLG-2397Lb, OGLE-2017-BLG-0604Lb, and OGLE-2017-BLG-1375Lb. We analyze the observed lensing light curves and determine their lensing parameters. From Bayesian analyses conducted with the constraints from the measured parameters, it is found that the masses of the hosts and planets are in the ranges $0.50\lesssim M_{\rm host}/M_\odot\lesssim 0.85$ and $0.5 \lesssim M_{\rm p}/M_{\rm J}\lesssim 13.2$, respectively, indicating that all planets are giant planets around host stars with subsolar masses. The lenses are located in the distance range of $3.8 \lesssim \dl/{\rm kpc}\lesssim 6.4$. It is found that the lenses of OGLE-2017-BLG-0604 and OGLE-2017-BLG-1375 are likely to be in the Galactic disk.
