论文标题
WASP-121b的苔丝全轨道相曲线的综合分析
Comprehensive analysis of TESS Full Orbital Phase Curve of WASP-121b
论文作者
论文摘要
我们介绍了Ultrahot Jupiter WASP-121B（$ r_p \ simeq 1.865 r_j，m_p \ simeq 1.184 m_j $）的全相曲线分析，使用过境外部外部调查卫星（TESS）的观测值以及我们与先前对该目标的研究结果进行了比较。我们的综合相位曲线模型包括初级过境，次要日食，热发射，反射和椭圆形潮汐失真，它们完全适合从数据集中同时提取所有参数的信息。我们还评估并计算了多普勒束缚的幅度为$ \ sim 2 $ ppm，但是考虑到光度数据的精确度，我们发现它并不重要。删除了仪器系统的噪声后，我们可靠地检测到次要的日食，深度为$ 489 _ { - 10}^{+16} $ parts-parts-parts-pert-pert-ppm（ppm），以热发射为主。使用Tess BandPass，我们测量$ 2941 _ { - 150}^{+61} k $和夜间$ 2236 _ { - 97}^{+38} k $温度wasp-121b。我们发现，热点与近地点很好地对齐，得出的结论是，从白天到夜间，热量分布效率低下。我们估计的几何反照率，$ a_g = 0.069 _ { - 0.02}^{+0.06} $，这表明WASP-121B具有低几何反相反照率。最后，我们估计的椭圆形变化信号幅度与理论期望的预测一致。
We present the full phase curve analysis of the ultrahot Jupiter WASP-121b ($R_p \simeq 1.865 R_J, M_p \simeq 1.184 M_J $) using observations from the Transiting Exoplanet Survey Satellite (TESS) and a comparison between our results with previous studies on this target. Our comprehensive phase curve model includes primary transit, secondary eclipse, thermal emission, reflection, and ellipsoidal tidal distortion, which are jointly fit to extract the information of all parameters simultaneously from the data sets. We also evaluated and calculated the amplitude of Doppler beaming to be $\sim 2$ ppm, but given the precision of the photometric data, we found it to be insignificant. After removing the instrumental systematic noise, we reliably detect the secondary eclipse with a depth of $489_{-10}^{+16}$ parts-per-million (ppm), dominated by thermal emission. Using the TESS bandpass, we measure the dayside $2941_{-150}^{+61} K$ and nightside $2236_{-97}^{+38} K $ temperatures of WASP-121b. We find that a hotspot is well aligned with the substellar point, leading to the conclusion that there is an inefficient heat distribution from the dayside to the nightside. Our estimated geometric albedo, $A_g = 0.069_{-0.02}^{+0.06}$, suggest that WASP-121b has a low geometric albedo. Finally, our estimated amplitude of the ellipsoidal variation signal is in agreement with the predictions of the theoretical expectations.
