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We consider the most energetically favorable symmetry-allowed spin-singletand spin-triplet superconducting pairing symmetries in monolayer and few-layergraphene, and for each calculate the energy spectrum in the presence of ascalar or magnetic impurity. We find that two doubly degenerate subgap statesexist for scalar impurities for all types of pairing, except for thespin-singlet $s$-wave state. For magnetic impurities, two or four subgap statesmay form depending on the order parameter symmetry. We find that the spinpolarization of these states allows one to distinguish between spin-singlet andtriplet pairing, for example, only the spin-triplet states show opposite-energysubgap states with the same spin. We also calculate the quasi-particleinterference patterns associated with the subgap states and find that theyexhibit features that could distinguish between different types of pairingsymmetries, especially a breaking of rotational symmetry for nodal states,stronger for the spin-singlet $d_{xy}$ and $d_{x^2-y^2}$ than for thespin-triplet $p_x$ and $p_y$ states.

Superconductivity in monolayer and few-layer graphene: III Impurity-induced subgap states and quasi-particle interference patterns