Consider the 2-dimensional torus $T^2=\mathbb{R}^2/\mathbb{Z}^2$, and a foliation on it (for example a foliation in circles, maybe the partition of the torus obtained form a Hopf-related map). I'm wondering if there are some condition on the foliation to be (the union of) the integral curves of a suitable vector field $X_\tau$ defined on the torus...
Note: One can clearly ask something more general (generic group action on a smooth manifold whose orbits are leaves of a given foliation), but I'm really dumb on making good (=well defined) questions so for the moment let's talk about a particular case.
Note 2: I'm not requiring much smoothness for $X_\tau$ just because I suspect that the answer will be "No if you suppose $X_\tau$ is not $C^k$-smooth with $k\ge k_0$".
Thanks a lot!