  We provide a derivation of a spin Skyrmion number classification for
two-dimensional topological superconductors constructed from ferromagnetic and
Rashba spin-orbit coupled semiconductor-superconductor heterostructures. We
show that in the non-trivial topological phase, characterized by a non-zero
Chern number, there is always a topological spin texture in the occupied bands
represented by a Skyrmion number. The Skyrmion number has the advantage of
being both physically intuitive and directly measurable using spin-sensitive
band structure imaging techniques. In addition, we show that the Skyrmion
classification can be extended to the equivalent one-dimensional topological
superconductors.
