  Cosmic voids defined as a subset of Delaunay Triangulation (DT) circumspheres
have been used to measure the Baryon Acoustic Oscillations (BAO) scale;
providing tighter constraints on cosmological parameters when combined with
matter tracers. These voids are defined as spheres larger than a given radius
threshold, which is constant over the survey volume. However, the response of
these void tracers to observational systematics has not yet been studied. In
this work we analyse the response of void clustering to selection effects. We
find for the case of moderate (<20 per cent) incompleteness, void selection
based on a constant radius cut yields robust measurements. This is particularly
true for BAO-reconstructed galaxy samples, where large-scale void exclusion
effects are mitigated. Moreover, we observe for the case of severe (up to 90
per cent) incompleteness -- such as can be found at the edges of the radial
selection function -- that an accurate estimation of the void distribution is
necessary for unbiased clustering measurements. In addition, we find that
without reconstruction, using a constant threshold under these conditions
produces a stronger void exclusion effect that can affect the clustering on
large scales. A new void selection criteria dependent on the (local) observed
tracer density that maximises the BAO peak significance prevents the
aforementioned exclusion features from contaminating the BAO signal. Finally,
we verify, with large simulations including light cone evolution, that both
void sample definitions (local and constant) yield unbiased and consistent BAO
scale measurements.
