Searches for top-like new particles with the ATLAS detector

Various extensions of the Standard Model predict the existence of new types of quarks. Potential search channels such are vector-like quarks that couple to light quarks and Z or W bosons or new quarks decaying to Z boson and b quark. Another potential extension would be the adjunction a 4th family of heavy chiral fermions that could provide new sources of CP violation to explain the matter-antimatter asymmetry in the Universe, and allow for a heavier Higgs boson while remaining consistent with other precision electroweak studies. We report on searches for vector like quarks and 4th generation quarks using the data sample recorded in 2011 at sqrt(s)=7 TeV centre-of-mass energy by the ATLAS experiment at the LHC.