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Proceedings Paper

A nulling coronagraph for TPF-C
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Paper Abstract

The nulling coronagraph is one of 5 instrument concepts selected by NASA for study for potential use in the TPF-C mission. This concept for extreme starlight suppression has two major components, a nulling interferometer to suppress the starlight to ~10-10 per airy spot within 2 λ/D of the star, and a calibration interferometer to measure the residual scattered starlight. The ability to work at 2 λ/D dramatically improves the science throughput of a space based coronagraph like TPF-C. The calibration interferometer is an equally important part of the starlight suppression system. It measures the measures the wavefront of the scattered starlight with very high SNR, to 0.05nm in less than 5 minutes on a 5mag star. In addition, the post coronagraph wavefront sensor will be used to measure the residual scattered light after the coronagraph and subtract it in post processing to 1~2x10-11 to enable detection of an Earthlike planet with a SNR of 5~10.

Paper Details

Date Published: 13 June 2006
PDF: 13 pages
Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 626517 (13 June 2006); doi: 10.1117/12.671934
Show Author Affiliations
Michael Shao, Jet Propulsion Lab./California Institute of Technology (United States)
Bruce Martin Levine, Jet Propulsion Lab./California Institute of Technology (United States)
James Kent Wallace, Jet Propulsion Lab./California Institute of Technology (United States)
Glenn S. Orton, Jet Propulsion Lab./California Institute of Technology (United States)
Edouard Schmidtlin, Jet Propulsion Lab./California Institute of Technology (United States)
Benjamin F. Lane, Massachusetts Institute of Technology (United States)
Sara Seager, Carnegie Institute of Washington (United States)
Volker Tolls, Harvard Smithsonian Ctr. for Astrophysics (United States)
Richard G. Lyon, NASA Goddard Space Flight Ctr. (United States)
Rocco Samuele, Northrup-Grumman Space Technology Corp. (United States)
Domenick J. Tenerelli, Lockheed Martin Space Systems Co. (United States)
Robert Woodruff, Lockheed Martin Space Systems Co. (United States)
Jian Ge, Univ. of Florida (United States)


Published in SPIE Proceedings Vol. 6265:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
John C. Mather; Howard A. MacEwen; Mattheus W. M. de Graauw, Editor(s)

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