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One of the key goals of exoplanet science is the atmospheric characterisationof super-Earths. Atmospheric abundances provide insight on the formation andevolution of those planets and help to put our own rocky planets in context.Observations on 55 Cancri e point towards a N-dominated atmosphere. In thispaper we explore this possibility, showing which will be the most abundantgases and observable species in emission and transmission spectroscopy of suchan atmosphere. We use analytical arguments and observed parameters to estimatethe possible thermal profile of the atmosphere and test three different extremepossibilities. The chemistry is calculated using equilibrium calculations andadopting Titan's elemental abundances as a potential N-dominated atmosphericcomposition. We also test the effect of different N/O ratios in the atmosphere.Emission and transmission spectra are computed and showed with a resolutionrelevant to future missions suitable to observe super-Earths (e.g. JWST,ARIEL). We find that even though N$_2$ is the most abundant molecule in theatmosphere followed by H$_2$ and CO, the transmission spectra shows strongfeatures of NH3 and HCN, and CO and HCN dominate emission spectra. We also showthat a decrease in the N/O ratio leads to stronger H2O, CO and CO2 and weakerNH3 and HCN features. A larger N/O is also more consistent with observations.Our exploration of a N-atmosphere for 55 Cancri e serve as a guide tounderstand such atmospheres and provide a reference for future observations.

Observability of molecular species in a nitrogen dominated atmosphere for 55 Cancri e