  Polarization aberrations originating from the telescope and high-contrast
imaging instrument optics introduce polarization-dependent speckles and
associated errors in the image plane, affecting the measured exoplanet signal.
Understanding this effect is critical for future space-based high-contrast
imaging instruments that aim to image the Earth analogs with 1e-10 raw contrast
and characterize their atmospheres. We present end-to-end modeling of the
polarization aberrations for a high-contrast imaging testbed, SCoOB. We use a
vector vortex coronagraph (VVC) as the focal plane mask, incorporate
polarization filtering, and estimate the peak contrast in the dark hole region.
The dominant polarization aberrations in the system are retardance defocus and
tilt due to the OAPs and fold mirrors. Although the mean contrast in the dark
hole region remains unaffected by the polarization aberrations, we see brighter
speckles limiting the contrast to 1e-9 at smaller inner working angles. We
extend the simulations using the measured retardance maps for the VVC. We find
that the mean contrast in SCoOB is more sensitive to the VVC and the QWP
retardance errors than the polarization aberrations.
