101. CODEX: the high-resolution visual spectrograph for the E-ELT
- Author
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G. Avila, Rafael Rebolo, Paolo Spanò, Paolo Molaro, B. Delabre, Roberto López, Francesco Pepe, M. T. Osorio, Sandro D'Odorico, Luca Pasquini, M. Dessauges, Valentina D'Odorico, Antonio Manescau, R. Garcia-Lopez, Filippo Maria Zerbi, Piercarlo Bonifacio, Stéphane Udry, Stefano Cristiani, Hans Dekker, Didier Queloz, Martin G. Haehnelt, B. Carswell, Denis Mégevand, and Michel Mayor
- Subjects
Physics ,business.industry ,Phase (waves) ,Slicing ,Radial velocity ,symbols.namesake ,Optics ,Planet ,symbols ,Calibration ,Focus (optics) ,business ,Spectrograph ,Doppler effect - Abstract
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.
- Published
- 2008