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In this paper we introduce CaRM, a semi-automatic code for the retrieval ofbroadband transmission spectra of transiting planets through the chromaticRossiter-McLaughlin method. We applied it to HARPS and ESPRESSO observations oftwo exoplanets to retrieve the transmission spectrum and we analyze its fittingtransmission models. We used the strong radius dependence of theRossiter-McLaughlin (RM) effect amplitude, caused by planetary companions, tomeasure the apparent radius change caused by the exoplanet atmosphere. In orderto retrieve the transmission spectrum, the radial velocities, which werecomputed over wavelength bins that encompass several spectral orders, were usedto simultaneously fit the Keplerian motion and the RM effect. From this, theradius ratio was computed as a function of the wavelength, which allows one toretrieve the low-resolution broadband transmission spectrum of a givenexoplanet. CaRM offers the possibility to use two Rossiter-McLaughlin modelstaken from ARoME and PyAstronomy, associated with a Keplerian function to fitradial velocities during transit observations automatically. Furthermore itoffers the possibility to use some methods that could, in theory, mitigate theeffect of perturbation in the radial velocities during transits. The CaRM codeallows one to retrieve the transmission spectrum of a given exoplanet usingminimal user interaction. We demonstrate that it allows one to compute thelow-resolution broadband transmission spectra of exoplanets observed usinghigh-resolution spectrographs such as HARPS and ESPRESSO.

CaRM: Exploring the chromatic Rossiter-McLaughlin effect. The cases of HD 189733b and WASP-127b