论文标题
NGTS-11 B / TOI-1847 b：从苔丝单跨事件中回收的过渡温暖的土星
NGTS-11 b / TOI-1847 b: A transiting warm Saturn recovered from a TESS single-transit event
论文作者
论文摘要
我们报告了NGTS-11 B（= TOI-1847 B）的发现，这是一个在K-Type Mid K型星（Teff = 5050 K）周围的35.46天轨道中的过渡土星。我们最初在苔丝全画幅图像灯曲线中从单跨事件中识别了系统。在使用NGTS望远镜进行79夜的光度监测后，我们观察到苔丝单传输事件大约一年后的NGTS-11 B的第二个完整传输。 NGTS运输确认了运输信号的参数，并将轨道周期限制为13个离散期。我们将过境检测与精确的径向速度测量结合在一起，以确定真实的轨道周期并测量行星的质量。我们发现NGTS-11 B的半径为0.817+0.028-0.032 $ r_j $，质量为0.344+0.092-0.073 $ M_J $，平衡温度仅为435+34-32 K，这是最酷的已知过渡性过渡气体之一。 NGTS-11 B是最初被识别为苔丝单传输事件后发现的第一个系外行星，其发现突出了从单跨事件中恢复较长周期的传输系外行星的强度光度监测的力量。
We report the discovery of NGTS-11 b (=TOI-1847 b), a transiting Saturn in a 35.46-day orbit around a mid K-type star (Teff=5050 K). We initially identified the system from a single-transit event in a TESS full-frame image light-curve. Following seventy-nine nights of photometric monitoring with an NGTS telescope, we observed a second full transit of NGTS-11 b approximately one year after the TESS single-transit event. The NGTS transit confirmed the parameters of the transit signal and restricted the orbital period to a set of 13 discrete periods. We combined our transit detections with precise radial velocity measurements to determine the true orbital period and measure the mass of the planet. We find NGTS-11 b has a radius of 0.817+0.028-0.032 $R_J$, a mass of 0.344+0.092-0.073 $M_J$, and an equilibrium temperature of just 435+34-32 K, making it one of the coolest known transiting gas giants. NGTS-11 b is the first exoplanet to be discovered after being initially identified as a TESS single-transit event, and its discovery highlights the power of intense photometric monitoring in recovering longer-period transiting exoplanets from single-transit events.
