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We present a study on the spatially scanned spectroscopic observations of thetransit of GJ 1132 b, a warm ($\sim$500 K) Super-Earth (1.13 R$_\oplus$) thatwas obtained with the G141 grism (1.125 - 1.650 $\mu$m) of the Wide FieldCamera 3 (WFC3) onboard the Hubble Space Telescope. We used the publiclyavailable Iraclis pipeline to extract the planetary transmission spectra fromthe five visits and produce a precise transmission spectrum. We analysed thespectrum using the TauREx3 atmospheric retrieval code with which we show thatthe measurements do not contain molecular signatures in the investigatedwavelength range and are best-fit with a flat-line model. Our results suggestthat the planet does not have a clear primordial, hydrogen-dominatedatmosphere. Instead, GJ 1132 b could have a cloudy hydrogen-dominated envelope,a very enriched secondary atmosphere, be airless, or have a tenuous atmospherethat has not been detected. Due to the narrow wavelength coverage of WFC3,these scenarios cannot be distinguished yet but the James Webb Space Telescopemay be capable of detecting atmospheric features, although several observationsmay be required to provide useful constraints.

ARES V: No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b