In this paper we explore possible extensions of Interacting Dark Energy cosmologies , where Dark Energy and Dark Matter interact non-gravitationally with one another .
In particular , we focus on the neutrino sector , analyzing the effect of both neutrino masses and the effective number of neutrino species .
We consider the Planck 2018 legacy release data combined with several other cosmological probes , finding no evidence for new physics in the dark radiation sector .
The current neutrino constraints from cosmology should be therefore regarded as robust , as they are not strongly dependent on the dark sector physics , once all the available observations are combined .
Namely , we find a total neutrino mass M _ { \nu } < 0.15 eV and a number of effective relativistic degrees of freedom of N _ { eff } = 3.03 ^ { +0.33 } _ { -0.33 } , both at 95 % CL , which are close to those obtained within the \Lambda CDM cosmology , M _ { \nu } < 0.12 eV and N _ { eff } = 3.00 ^ { +0.36 } _ { -0.35 } for the same data combination .