We consider supersymmetric AdS3 × Y7 and AdS2 × Y9 solutions of type IIB
and D = 11 supergravity, respectively, that are holographically dual to SCFTs with (0, 2)
supersymmetry in two dimensions and N = 2 supersymmetry in one dimension. The
geometry of Y2n+1, which can be defined for n ≥ 3, shares many similarities with SasakiEinstein geometry, including the existence of a canonical R-symmetry Killing vector, but
there are also some crucial differences. We show that the R-symmetry Killing vector may
be determined by extremizing a function that depends only on certain global, topological
data. In particular, assuming it exists, for n = 3 one can compute the central charge of
an AdS3 × Y7 solution without knowing its explicit form. We interpret this as a geometric
dual of c-extremization in (0, 2) SCFTs. For the case of AdS2 × Y9 solutions we show that
the extremal problem can be used to obtain properties of the dual quantum mechanics,
including obtaining the entropy of a class of supersymmetric black holes in AdS4. We also
study many specific examples of the type AdS3×T
2×Y5, including a new family of explicit
supergravity solutions. In addition we discuss the possibility that the (0, 2) SCFTs dual
to these solutions can arise from the compactification on T
2 of certain d = 4 quiver gauge
theories associated with five-dimensional Sasaki-Einstein metrics and, surprisingly, come
to a negative conclusion.