A bstract We find a new supersymmetric solution of type IIB supergravity which is holographically dual to the planar limit of the four-dimensional N = 2 ? $$ mathcal{N}={2}^{st } $$ supersymmetric Yang-Mills theory on S _(4). We study a probe fundamental string in this background which is dual to a supersymmetric Wilson loop in the N = 2 ? $$ mathcal{N}={2}^{st } $$ theory. Using holography we calculate the expectation value of this line operator to leading order in the ’t Hooft coupling. The result is a non-trivial function of the mass parameter of the N = 2 ? $$ mathcal{N}={2}^{st } $$ theory that precisely matches the result from supersymmetric localization.
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