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Arbitrary amplitude dust acoustic solitary structures have been investigatedin a four component multi-species plasma consisting of negatively charged dustgrains, nonthermal ions, isothermally distributed electrons and positronsincluding the effect of dust temperature. We have used the Sagdeevpseudo-potential method to discuss the arbitrary amplitude steady state dustacoustic solitary structures in the present plasma system. We have designed acomputational scheme to draw the existence domains of different dust acousticsolitary structures. We have observed only negative potential solitary wavesfor isothermal ions. But for strong nonthermality of ions the system supportspositive potential solitary waves, positive potential double layers andcoexistence of solitary waves of both polarities. The positive potentialsolitary waves are restricted by the positive potential double layers butnegative potential double layer has not been found for any parameter regime.The system does not support dust acoustic supersoliton of any polarity. Theconcentration of positrons plays an important role in the formation of positivepotential double layers. Finally, the phase portraits of the dynamical systemhave been presented to confirm the existence of different dust acousticsolitary structures.

Dust acoustic solitary structures in presence of nonthermal ions, isothermally distributed electrons and positrons