  The nature of Type Ia supernova progenitors is still unclear. The outstanding
characteristic of the single-degenerate scenario is that it contains hydrogen
in the binary companion of the exploding white dwarf star, which, if mixed into
the ejecta of the supernova in large amounts may lead to conflicts with the
observations thus ruling out the scenario. We investigate the effect of the
impact of Type Ia supernova ejecta on a main sequence companion star of the
progenitor system. With a series of simulations we investigate how different
parameters of this system affect the amount of hydrogen stripped from the
companion by the impact. The stellar evolution code GARSTEC is used to set up
the structure of the companion stars mimicking the effect of a binary evolution
phase. The impact itself is simulated with the smoothed particle hydrodynamics
code GADGET2. We reproduce and confirm the results of earlier grid-based
hydrodynamical simulation. Parameter studies of the progenitor system are
extended to include the results of recent binary evolution studies. The more
compact structure of the companion star found here significantly reduces the
stripped hydrogen mass. The low hydrogen masses resulting from a more realistic
companion structure are consistent with current observational constraints.
Therefore, the single-degenerate scenario remains a valid possibility for Type
Ia supernova progenitors. These new results are not a numerical effect, but the
outcome of different initial conditions.
