Small-grid dithers for the JWST coronagraphs | Zendy

Charles-Philippe Lajoie | Zendy; Rémi Soummer | Zendy; Laurent Pueyo | Zendy; Dean C. Hines | Zendy; Edmund Nelan | Zendy; Marshall D. Perrin | Zendy; Mark Clampin | Zendy; John C. Isaacs | Zendy

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Small-grid dithers for the JWST coronagraphs

Author(s) -

Charles-Philippe Lajoie,

Rémi Soummer,

Laurent Pueyo,

Dean C. Hines,

Edmund Nelan,

Marshall D. Perrin,

Mark Clampin,

John C. Isaacs

Publication year - 2016

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.2233032

Subject(s) - dither , james webb space telescope , pixel , speckle pattern , optics , exoplanet , physics , adaptive optics , grid , coronagraph , spatial light modulator , ranging , remote sensing , computer science , computer vision , astronomy , planet , telescope , noise shaping , geometry , mathematics , telecommunications , geology

We discuss new results of coronagraphic simulations demonstrating a novel mode for JWST that utilizes sub-pixel dithered reference images, called Small-Grid Dithers, to optimize coronagraphic PSF subtraction. These sub-pixel dithers are executed with the Fine Steering Mirror under fine guidance, are accurate to ~2-3 milliarcseconds (1-σ/axis), and provide ample speckle diversity to reconstruct an optimized synthetic reference PSF using LOCI or KLIP. We also discuss the performance gains of Small-Grid Dithers compared to the standard undithered scenario, and show potential contrast gain factors for the NIRCam and MIRI coronagraphs ranging from 2 to more than 10, respectively.

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