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Ultra-hot Jupiters (UHJs) are expected to possess temperature inversionlayers in their dayside atmospheres. Recent thermal emission observations havediscovered several atomic and molecular species along with temperatureinversions in UHJs. We observed the thermal emission spectra of two UHJs(WASP-33b and WASP-189b) with the GIANO-B high-resolution near-infraredspectrograph. Using the cross-correlation technique, we detected carbonmonoxide (CO) in the dayside atmospheres of both planets. The detected CO linesare in emission, which agrees with previous discoveries of iron emission linesand temperature inversions in the two planets. This is the first detection ofCO lines in emission with high-resolution spectroscopy. Further retrieval workcombining the CO lines with other spectral features will enable a comprehensiveunderstanding of the atmospheric properties such as temperature structures andC/O ratios. The detected CO and iron emission lines of WASP-189b haveredshifted radial velocities of several km/s, which likely originate from adayside to nightside wind in its atmosphere. Such a redshifted velocity has notbeen detected for the emission lines of WASP-33b, suggesting that theatmospheric circulation patterns of the two UHJs may be different.

Detection of CO emission lines in the dayside atmospheres of WASP-33b and WASP-189b with GIANO