Modelling the mid-infrared polarization in dust around young stars
  The presence of crystalline silicates has been detected in the circumstellar
environment of several young stars in the recent past and there is evidence of
silicon carbide (SiC) detection in the envelope of pre-main sequence star
SVS13. In this work, we have attempted to probe the presence of SiC in the dust
around protoplanetary disks in a sample of young stars. We have modelled the
linear polarization of composite dust grains in the mid-infrared (MIR: 8--13
$\mu$m) using silicates as the host with various inclusions of SiC and
graphites using the Discrete Dipole Approximation (DDA) and the Effective
Medium Approximation (EMA) T-Matrix methods. We have then compared our
modelling results with polarimetric observations made in the protoplanetary
disks surrounding two Herbig Be stars and one T-Tauri star with particular
emphasis towards the 10 $\mu$m silicate feature using CanariCam mounted over
the Gran Telescopio Canarias (GTC). We report the possible existence of SiC in
the outer disk/envelope around one star in our sample which has been
interpreted based on the shape, size, composition and fraction of inclusions by
volume in our dust grain models.
