Astrophysics (Index)About


(high contrast imaging)
(imaging of targets very near bright objects)

The abbreviation HCI is used for high contrast imaging generally meaning imaging of an object that is very near a bright object, such as imaging an extra-solar planet despite the much-brighter light from its parent star. A number of specific techniques are used to accomplish this. Generally, a coronagraph is incorporated into the instrument or observation.

High contrast spectroscopy (or high contrast spectrography, or sometimes HCS) is spectrography of such targets. Post-processing is used to isolate the planet's spectrum through knowledge of the star's spectrum, which inevitably is not entirely suppressed, despite the coronagraph. A spectrograph with a high spectral resolution (HRS aka HDS) assists in this improvement of the signal-to-noise ratio. The term HCI+HDS has been used for this combination of techniques.

Further reading:

Referenced by page:
Lyot coronagraph (CLC)