Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab
Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab
复制标题
凌日热木星 KELT-2Ab 热发射光谱的地基和空基探测
作者：
D. Piskorz;C. Buzard;M. Line;H. Knutson;B. Benneke;N. Crockett;A. Lockwood;G. Blake;T. Barman;C. Bender;D. Deming;J. Johnson
我们描述了凌日热木星KELT-2Ab的大气中水蒸气的探测，通过将恒星-行星系统处理为具有高分辨率地面光谱的二元光谱。我们通过对恒星和行星的深度联合通量观测来解析行星运动的信号。利用Keck NIRSPEC l波段的6个历元观测数据，利用自洽大气模式网格对数据进行了互相关分析。我们测量到开普勒速度的径向投影KP为148±7 km s−1，与凌日测量结果一致，并探测到3.8σ的水蒸气。我们将NIRSPEC l波段数据与斯皮策IRAC二次日食数据相结合，进一步探测KELT-2Ab大气的金属丰度和碳氧比。虽然NIRSPEC分析对斯皮策的数据提供了一些额外的限制，但它确实对金属丰度和碳氧比提供了大致相同的限制。这对未来对非凌日热木星大气层的研究来说是个好兆头。
We describe the detection of water vapor in the atmosphere of the transiting hot Jupiter KELT-2Ab by treating the star–planet system as a spectroscopic binary with high-resolution, ground-based spectroscopy. We resolve the signal of the planet’s motion with deep combined flux observations of the star and the planet. In total, six epochs of Keck NIRSPEC L-band observations were obtained, and the full data set was subjected to a cross-correlation analysis with a grid of self-consistent atmospheric models. We measure a radial projection of the Keplerian velocity, KP, of 148 ± 7 km s−1, consistent with transit measurements, and detect water vapor at 3.8σ. We combine NIRSPEC L-band data with Spitzer IRAC secondary eclipse data to further probe the metallicity and carbon-to-oxygen ratio of KELT-2Ab’s atmosphere. While the NIRSPEC analysis provides few extra constraints on the Spitzer data, it does provide roughly the same constraints on metallicity and carbon-to-oxygen ratio. This bodes well for future investigations of the atmospheres of non-transiting hot Jupiters.
英国气象局全球环流模型采用复杂的辐射方案应用于热木星 HD 209458b
影响因子：
6.5
作者：
Amundsen D
通讯作者：
Amundsen D