标题： 一个全球视角及对超热木星WASP-19b的更新约束：大气特性与恒星活动 显示英文标题

标题： A Global Perspective with Updated Constraints on the Ultra-hot Jupiter WASP-19b: Atmospheric Properties and Stellar Activity

摘要： 我们对WASP-19b的大气特性进行了详细的重新分析，WASP-19b是一个超热木星（1.14 M Jup，1.41 R Jup），每0.79天绕一颗活跃的类太阳恒星运行。 我们重新分析了由哈勃空间望远镜的宽视场相机3光谱仪（1.1 - 1.7微米）观测到的WASP-19b的凌日和二次掩食。 当与更长波长的斯皮策望远镜测光数据结合时，我们的分析表明在行星的传输光谱和发射光谱中都存在水吸收特征，这与之前发表的研究结果一致。 为了限制其大气成分，并更深入地探索恒星活动对其传输光谱的影响，我们联合拟合了WASP-19b的白昼面发射光谱和传输光谱，并使用反演模型进行拟合。 我们还将自己的白昼面发射光谱与一般环流模型的预测进行了比较，并得出结论，认为磁场阻力在塑造WASP-19b的大气环流中相对不重要。 最后，我们将WASP-19b的白昼面水吸收特征大小与具有类似测量值的热木星群体进行了比较，并表明它位于温度反转首次开始出现的过渡辐射区域。 与之前的研究一样，我们发现当前的观测对该行星的大气特性提供了相对较弱的约束。 如果通过JWST/NIRSpec PRISM在更长波长下增加光谱分辨观测，这些约束可以得到显著改善。 显示英文摘要

摘要： We present a detailed reanalysis of the atmospheric properties of WASP-19b, an ultra-hot Jupiter (1.14 M Jup, 1.41 R Jup) orbiting an active Sun-like star every 0.79 day. We reanalyze a transit and secondary eclipse of WASP-19b observed by the Hubble Space Telescope's Wide Field Camera 3 spectrograph (1.1 - 1.7 microns). When combined with Spitzer photometry at longer wavelengths, our analyses indicate the presence of water absorption features in both the planet's transmission and emission spectra, consistent with results from previously published studies. We jointly fit WASP-19b's dayside emission and transmission spectra with a retrieval model in order to constrain its atmospheric composition, and explore the effect of stellar activity on its transmission spectrum in greater depth. We also compare our dayside emission spectrum to predictions from a general circulation model, and conclude that magnetic drag appears to be relatively unimportant in shaping WASP-19b's atmospheric circulation. Lastly, we compare the size of WASP-19b's dayside water absorption feature to the population of hot Jupiters with similar measurements, and show that it is located in the transitional irradiation regime where temperature inversions first begin to emerge. As in previous studies, we find that the current observations provide relatively weak constraints on this planet's atmospheric properties. These constraints could be significantly improved by the addition of spectroscopically resolved observations at longer wavelengths with JWST/NIRSpec PRISM.