9 July 2008 CODEX: the high-resolution visual spectrograph for the E-ELT
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Luca Pasquini, G. Avila, H. Dekker, B. Delabre, S. D'Odorico, A. Manescau, M. Haehnelt, B. Carswell, R. Garcia-Lopez, R. Lopez, M. T. Osorio, R. Rebolo, S. Cristiani, P. Bonifacio, V. D'Odorico, P. Molaro, P. Spanò, F. Zerbi, M. Mayor, M. Dessauges, D. Megevand, F. Pepe, D. Queloz, and S. Udry "CODEX: the high-resolution visual spectrograph for the E-ELT", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70141I (9 July 2008); doi: 10.1117/12.787936; https://doi.org/10.1117/12.787936
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