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High resolution spectroscopy has opened the way for new, detailed study ofexoplanet atmospheres. There is evidence that this technique can be sensitiveto the complex, three-dimensional (3D) atmospheric structure of these planets.In this work, we perform cross correlation analysis on high resolution(R~100,000) CRIRES/VLT emission spectra of the Hot Jupiter HD 209458b. Wegenerate template emission spectra from a 3D atmospheric circulation model ofthe planet, accounting for temperature structure and atmosphericmotions---winds and planetary rotation---missed by spectra calculated fromone-dimensional models. In this first-of-its-kind analysis, we find that usingtemplate spectra generated from a 3D model produces a more significantdetection (6.9 sigma) of the planet's signal than any of the hundreds ofone-dimensional models we tested (maximum of 5.1 sigma). We recover theplanet's thermal emission, its orbital motion, and the presence of CO in itsatmosphere at high significance. Additionally, we analyzed the relativeinfluences of 3D temperature and chemical structures in this improveddetection, including the contributions from CO and H2O, as well as the role ofatmospheric Doppler signatures from winds and rotation. This work shows thatthe Hot Jupiter's 3D atmospheric structure has a first-order influence on itsemission spectra at high resolution and motivates the use of multi-dimensionalatmospheric models in high-resolution spectral analysis.

A Significant Increase in Detection of High-Resolution Emission Spectra Using a Three-Dimensional Atmospheric Model of a Hot Jupiter