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We consider a cosmology in which dark matter and a quintessence scalar fieldresponsible for the acceleration of the Universe are allowed to interact.Allowing for both conformal and disformal couplings, we perform a globalanalysis of the constraints on our model using Hubble parameter measurements,baryon acoustic oscillation distance measurements, and a Supernovae Type Iadata set. We find that the additional disformal coupling relaxes the conformalcoupling constraints. Moreover we show that, at the background level, adisformal interaction within the dark sector is preferred to both $\Lambda$CDMand uncoupled quintessence, hence favouring interacting dark energy.

Testing coupled dark energy models with their cosmological background evolution