PROCEEDINGS ARTICLE | July 9, 2008
Proc. SPIE. 7014, Ground-based and Airborne Instrumentation for Astronomy II
KEYWORDS: Telescopes, Spectrographs, Optical design, Doppler effect, Visualization, Cameras, Sensors, Calibration, Monte Carlo methods, Spectral resolution
A number of outstanding scientific problems require a high resolution, visual spectrograph at the E-ELT. Measuring the
dynamics of the universe, finding earth-like planets with radial velocity techniques, determining the chemical evolution
of the intergalactic medium and if physical constants varied in the past, all require a superior capability of measuring
exceedingly small Doppler shifts. We have started a Phase A study for CODEX at the E-ELT. We present here the
scientific cases, the requirements, the basic technical choices and trade offs, as well as a couple of design under
evaluation. We aim at a super stable instrument, capable of obtaining a radial velocity precision of 2 cm/sec over several
decades. It will be located at the coude focus. The design will make use of anamorphosis, pupil slicing, slanted VPH
gratings and a novel calibration system based on laser frequency combs. Several CODEX-related R&D activities are
running, and, in addition, a Call for Proposal for a precursor at the VLT has been issued.