  Angular and spectral differential imaging is an observational technique used
in astronomy to study the close environment of stars. The relative angular
motion and spectral scaling between on-axis and off-axis sources are exploited
by processing techniques to separate two components: the residual light from
the star and the light coming from surrounding objects such as circumstellar
disks. This paper describes a method to unmix these two components and
deconvolve the image of disks. It is based on a statistical modeling of the
residual star light, in particular its spatial and spectral correlations. These
correlations have so far been neglected by standard reconstruction techniques.
We show on several datasets from the SPHERE instrument at the Very Large
Telescope, Chile, that accounting for correlations strongly improves the
reconstructions.

Instrumentation and Methods for Astrophysics