Surfaces with $χ=5, K^{2}=9$ and a canonical involution

In this paper, we classify the minimal surfaces of general type with $χ=5$, $K^{2}=9$ whose canonical map is composed with an involution. We obtain 6 families, whose dimensions in the moduli space are 28, 27, 33, 32, 31 and 32 respectively. Among them, the family of surfaces having a genus 2 fibration forms an irreducible component of $\mathfrak{M}_{χ=5, K^{2}=9}$.

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