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It is investigated the cosmological dynamics of scalar-torsion $f(T,\phi)$gravity as a dark energy model, where $T$ is the torsion scalar of teleparallelgravity and $\phi$ is a canonical scalar field. In this context, we areconcerned with the phenomenology of the class of models with non-linearcoupling to gravity and exponential potential. We obtain the critical points ofthe autonomous system, along with the stability conditions of each one of themand their cosmological properties. Particularly, we show the existence of newattractors with accelerated expansion, as well as, new scaling solutions inwhich the energy density of dark energy scales as the background fluid density,thus, defining the so-called scaling radiation and scaling matter epochs. Thescaling solutions are saddle points, and therefore, the system exits thesesolutions to the current epoch of cosmic acceleration, towards an attractorpoint describing the dark energy-dominated era.

Cosmological dynamics of dark energy in scalar-torsion $f(T,\phi)$ gravity