Is there a polynomial vector field on $\mathbb{R}^2$ whose corresponding singular complex foliation of $\mathbb{C}^2 $ admits a complex limit cycle $L$ such that $L$ does not intersect the real plane $\mathbb{R}^2 $, moreover $L$ is not an algebraic leaf?
The following paper provide an example of this situation except the non-algebraic requirement.
In Question 1 of this note we pose the above question