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The detection of lines in emission in planetary atmospheres provides directevidence of temperature inversion. We confirm the trend of ultra-hot Jupitersorbiting A-type stars showing temperature inversions on their daysides, bydetecting metals emission lines in the dayside of KELT-20b. We first detect theplanetary emission by using the G2 stellar mask of the HARPS-N pipeline, whichis mainly composed of neutral iron lines, as a template. Using neutral irontemplates, we perform a retrieval of the atmospheric temperature-pressureprofile of the planet, confirming a thermal inversion. Then we create models ofplanetary emission of different species using the retrieved invertedtemperature-pressure profile. By using the cross-correlation technique, wedetect FeI, FeII and CrI at signal-to-noise ratio levels of 7.1, 3.9 and 3.6,respectively. The latter is detected for the first time in emission in theatmosphere of an exoplanet. Contrary to FeI, FeII and CrI are detected onlyafter the occultation and not before, hinting for different atmosphericproperties in view on the pre- and post- occultation orbital phases. A furtherretrieval of the temperature-pressure profile performed independently on thepre- and post- occultation phases, while not highly significant, points to asteeper thermal inversion in the post-occultation.

The GAPS Programme at TNG XXXIII. HARPS-N detects multiple atomic species in emission from the dayside of KELT-20b