Constraints on mediator-based dark matter models using $\sqrt s = 13$ TeV $pp$ collisions at the LHC with the ATLAS detector

Constraints on selected mediator-based dark matter models using $\sqrt s = 13$~TeV $pp$ collisions collected by the ATLAS detector during the years 2015-2016 are summarised in this note. The results of experimental searches in a variety of final states are interpreted in terms of a set of spin-1 and spin-0 single-mediator dark matter simplified models and a second set of models involving an extended-Higgs sector plus an additional vector or pseudo-scalar mediator.