We present an overview of the EXoplanetary Circumstellar Environments and Disk Explorer (EXCEDE), selected by
NASA for technology development and maturation. EXCEDE will study the formation, evolution and architectures of
exoplanetary systems, and characterize circumstellar environments into stellar habitable zones. EXCEDE provides
contrast-limited scattered-light detection sensitivities ~ 1000x greater than HST or JWST coronagraphs at a much
smaller effective inner working angle (IWA), thus enabling the exploration and characterization of exoplanetary
circumstellar disks in currently inaccessible domains. EXCEDE will utilize a laboratory demonstrated high-performance
Phase Induced Amplitude Apodized Coronagraph (PIAA-C) integrated with a 70 cm diameter unobscured aperture
visible light telescope. The EXCEDE PIAA-C will deliver star-to-disk augmented image contrasts of < 10E-8 and a 1.2
λ/D IWA or 0.14” with a wavefront control system utilizing a 2000-element MEMS DM and fast steering mirror.
EXCEDE will provide 0.12” spatial resolution at 0.4 μm with dust detection sensitivity to levels of a few tens of zodis
with two-band imaging polarimetry. EXCEDE is a science-driven technology pathfinder that will advance our
understanding of the formation and evolution of exoplanetary systems, placing our solar system in broader astrophysical
context, and will demonstrate the high contrast technologies required for larger-scale follow-on and multi-wavelength
investigations on the road to finding and characterizing exo-Earths in the years ahead.
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Olivier Guyon ; Glenn Schneider ; Ruslan Belikov and Domenick J. Tenerelli
The EXoplanetary Circumstellar Environments and Disk Explorer (EXCEDE)
", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84421S (August 22, 2012); doi:10.1117/12.927188; http://dx.doi.org/10.1117/12.927188