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Multiband photometric transit observations or low-resolution spectroscopy(spectro-photometry) are normally used to retrieve the broadband transmissionspectra of transiting exoplanets in order to assess the chemical composition oftheir atmospheres. In this paper, we present an alternative approach forrecovering the broadband transmission spectra using chromatic Dopplertomography based on physical modeling through the SOAP tool: CHOCOLATE(CHrOmatiC line prOfiLe tomogrAphy TEchnique). To validate the method andexamine its performance, we use observational data recently obtained with theESPRESSO instrument to retrieve the transmission spectra of the archetypal hotJupiter HD 209458b. Our findings indicate that the recovered transmissionspectrum is in good agreement with the results presented in previous studies,which used different methodologies to extract the spectrum, achieving similarprecision. We explored several atmospheric models and inferred from spectralretrieval that a model containing H2O and NH3 is the preferred scenario. TheCHOCOLATE methodology is particularly interesting for future studies ofexoplanets around young and active stars or moderate to fast rotating stars,considering SOAP's ability to model stellar active regions and the fact thatthe rotational broadening of spectral lines favors its application.Furthermore, CHOCOLATE will allow the broad transmission spectrum of a planetto be retrieved using high signal-to-noise ratio, high-resolution spectroscopywith the next generation of Extremely Large Telescopes (ELTs), wherelow-resolution spectroscopy will not always be accessible.

Retrieving the transmission spectrum of HD 209458b using CHOCOLATE: A new chromatic Doppler tomography technique