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We present an overview of the EXoplanetary Circumstellar Environments andDisk Explorer (EXCEDE), selected by NASA for technology development andmaturation. EXCEDE will study the formation, evolution and architectures ofexoplanetary systems, and characterize circumstellar environments into stellarhabitable zones. EXCEDE provides contrast-limited scattered-light detectionsensitivities ~ 1000x greater than HST or JWST coronagraphs at a much smallereffective inner working angle (IWA), thus enabling the exploration andcharacterization of exoplanetary circumstellar disks in currently inaccessibledomains. EXCEDE will utilize a laboratory demonstrated high-performance PhaseInduced Amplitude Apodized Coronagraph (PIAA-C) integrated with a 70 cmdiameter unobscured aperture visible light telescope. The EXCEDE PIAA-C willdeliver star-to-disk augmented image contrasts of < 10E-8 and a 1.2 L/D IWA or140 mas with a wavefront control system utilizing a 2000-element MEMS DM andfast steering mirror. EXCEDE will provide 120 mas spatial resolution at 0.4microns with dust detection sensitivity to levels of a few tens of zodis withtwo-band imaging polarimetry. EXCEDE is a science-driven technology pathfinderthat will advance our understanding of the formation and evolution ofexoplanetary systems, placing our solar system in broader astrophysicalcontext, and will demonstrate the high contrast technologies required forlarger-scale follow-on and multi-wavelength investigations on the road tofinding and characterizing exo-Earths in the years ahead.

The EXoplanetary Circumstellar Environments and Disk Explorer (EXCEDE)