  Teleparallel gravity is an equivalent formulation of general relativity in
which instead of the Ricci scalar $R$, one uses the torsion scalar $T$ for the
Lagrangian density. Recently teleparallel dark energy has been proposed by Geng
et al. in (Geng et al., 2011). They have added quintessence scalar field,
allowing also a non-minimal coupling with gravity in the Lagrangian of
teleparallel gravity and found that such a non-minimally coupled quintessence
theory has a richer structure than the same one in the frame work of general
relativity. In the present work we are interested in tachyonic teleparallel
dark energy in which scalar field is responsible for dark energy in the frame
work of torsion gravity. We find that such a non-minimally coupled tachyon
gravity can realize the crossing of the phantom divide line for the effective
equation of state. Using the numerical calculations we display such a behavior
of the model explicitly.
