  A model for a homogeneous, isotropic, flat Universe composed by dark energy
and matter is investigated. Dark energy is considered to behave as a tachyon
field, which is non-minimally coupled to gravity. The connection is treated as
metric independent when varying the action, providing an extra term to the
Lagrangian density. The self-interaction potential and coupling are naturally
found by imposing a Noether symmetry to the system. We analyze the evolution of
the density parameters and we compare the results obtained for the deceleration
parameter, luminosity distance and Hubble parameter with those found in
literature from observational data.
