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Carbon monoxide was recently reported in the atmosphere of the hot JupiterWASP-39b using the NIRSpec PRISM transit observation of this planet, collectedas part of the JWST Transiting Exoplanet Community Early Release Science (JTECERS) Program. This detection, however, could not be confidently confirmed inthe initial analysis of the higher resolution observations with NIRSpec G395Hdisperser. Here we confirm the detection of CO in the atmosphere of WASP-39busing the NIRSpec G395H data and cross-correlation techniques. We do this bysearching for the CO signal in the unbinned transmission spectrum of the planetbetween 4.6 and 5.0 $\mu$m, where the contribution of CO is expected to behigher than that of other anticipated molecules in the planet's atmosphere. Oursearch results in a detection of CO with a cross-correlation function (CCF)significance of $6.6 \sigma$ when using a template with only ${\rm^{12}C^{16}O}$ lines. The CCF significance of the CO signal increases to $7.5\sigma$ when including in the template lines from additional CO isotopologues,with the largest contribution being from ${\rm ^{13}C^{16}O}$. Our resultshighlight how cross-correlation techniques can be a powerful tool for unveilingthe chemical composition of exoplanetary atmospheres from medium-resolutiontransmission spectra, including the detection of isotopologues.

Detection of Carbon Monoxide in the Atmosphere of WASP-39b Applying Standard Cross-Correlation Techniques to JWST NIRSpec G395H Data