Searches for heavy resonances decaying to top quarks with the ATLAS detector

Several models of physics beyond the Standard Model contain preferential couplings to top quarks. A search for new phenomena in t̄t final states with additional heavy-flavour jets as well as the new physics of heavy gauge bosons hadronically-decaying resonances. The searches have been carried out using proton-proton collision data collected with the ATLAS detector at LHC at a centre-of-mass energy of 13 TeV. Data are analysed in the lepton-plus-jets final state and as large-radius jets, characteristic of signal events.