Centering Procedures with the Coronagraphs of MIRI

Details Centering Procedures with the Coronagraphs of MIRI Centering Procedures with the Coronagraphs of MIRI

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confq..49c&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Computer Science

Scientific paper

MIRI is a mid IR instrument of the JWST equipped with four coronagraphs. Three of them are 'Four Quadrant Phase Masks' providing small Inner Working Angle well suited to mid IR wavelengths. The problem of pointing with a coronagraph is critical because of the non linearity of the component and usually the need to match the diffraction of the star with that of a calibration star. I will first present the capabilities of detection of MIRI coronagraphs and their sensitivity to the pointing errors. Once these constraints set, I will study which centering algorithm is robust and accurate enough to satisfy them and will propose an observational strategy.

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