15 September 2005 High contrast imaging with the JWST NIRCAM coronagraph
Author Affiliations +
Proceedings Volume 5905, Techniques and Instrumentation for Detection of Exoplanets II; 59050L (2005); doi: 10.1117/12.619343
Event: Optics and Photonics 2005, 2005, San Diego, California, United States
Abstract
Relative to ground-based telescopes, the James Webb Space Telescope (JWST) will have a substantial sensitivity advantage in the 2.2-5μm wavelength range where brown dwarfs and hot Jupiters are thought to have significant brightness enhancements. To facilitate high contrast imaging within this band, the Near-Infrared Camera (NIRCAM) will employ a Lyot coronagraph with an array of band-limited image-plane occulting spots. In this paper, we provide the science motivation for high contrast imaging with NIRCAM, comparing its expected performance to that of the Keck, Gemini and 30 m (TMT) telescopes equipped with Adaptive Optics systems of different capabilities. We then describe our design for the NIRCAM coronagraph that enables imaging over the entire sensitivity range of the instrument while providing significant operational flexibility. We describe the various design tradeoffs that were made in consideration of alignment and aberration sensitivities and present contrast performance in the presence of JWST's expected optical aberrations. Finally we show an example of a two-color image subtraction that can provide 10-5 companion sensitivity at sub-arcsecond separations.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph J. Green, Charles Beichman, Scott A. Basinger, Scott Horner, Michael Meyer, David C. Redding, Marcia Rieke, John T. Trauger, "High contrast imaging with the JWST NIRCAM coronagraph", Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59050L (15 September 2005); doi: 10.1117/12.619343; https://doi.org/10.1117/12.619343
PROCEEDINGS
11 PAGES


SHARE
KEYWORDS
James Webb Space Telescope

Stars

Coronagraphy

Telescopes

Space telescopes

Adaptive optics

Planets

RELATED CONTENT

The Gemini planet imager: first light and commissioning
Proceedings of SPIE (August 07 2014)
Advanced speckle sensing for internal coronagraphs
Proceedings of SPIE (September 15 2011)
eXtreme Adaptive Optics Planet Imager: overview and status
Proceedings of SPIE (October 25 2004)
Optimized shaped pupil masks for pupil with obscuration
Proceedings of SPIE (September 21 2012)
The Gemini Planet Imager from science to design to...
Proceedings of SPIE (July 11 2008)

Back to Top