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We study the orbital-dependent superconducting pairing in a five-orbitalt-J1-J2 model for iron pnictides. Depending on the orbital selectivity ofelectron correlations and the orbital characters along the Fermi surface, thesuperconducting gap in an A_{1g} pairing state may exhibit anisotropy. Thisanisotropy varies with the degree of J1-J2 magnetic frustration. We have alsocalculated the dynamical spin susceptibility in the superconducting state. Thefrequency dependence of the susceptibility at the antiferromagnetic wavevector(\pi,0) shows a resonance, whose width is enhanced by the orbital dependence ofthe superconducting gap; when the latter is sufficiently strong, the resonancepeak may be split into two. We discuss the implications of our results on therecent angle-resolved photoemission and neutron-scattering measurements inseveral superconducting iron pnictides.

Orbital-selective superconductivity, gap anisotropy and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides