An infinite family of hyperovals of Q+(5,q), q even

Abstract

We construct an infinite family of hyperovals on the Klein quadric $Q^{+}(5,q)$, q even. The construction makes use of ovoids of the symplectic generalized quadrangle $W\left(q\right)$ that is associated with an elliptic quadric which arises as solid intersection with $Q^{+}(5,q)$. We also solve the isomorphism problem: we determine necessary and sufficient conditions for two hyperovals arising from the construction to be isomorphic.