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The Astro2010 Decadal Survey recommended a Wide Field Infrared SurveyTelescope (WFIRST) as its top priority for a new large space mission. Asconceived by the decadal survey, WFIRST would carry out a dark energy scienceprogram, a microlensing program to determine the demographics of exoplanets,and a general observing program utilizing its ultra wide field. In October2012, NASA chartered a Science Definition Team (SDT) to produce, incollaboration with the WFIRST Project Office at GSFC and the Program Office atJPL, a Design Reference Mission (DRM) for an implementation of WFIRST using oneof the 2.4-m, Hubble-quality mirror assemblies recently made available to NASA.This DRM builds on the work of the earlier WFIRST SDT, reported by Green et al.(2012). The 2.4-m primary mirror enables a mission with greater sensitivity andhigher angular resolution than the 1.3-m and 1.1-m designs consideredpreviously, increasing both the science return of the primary surveys and thecapabilities of WFIRST as a Guest Observer facility. The option of adding anon-axis, coronagraphic instrument would enable imaging and spectroscopicstudies of planets around nearby stars. This document presents the final reportof the SDT.

Wide-Field InfraRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA Final Report