20 July 2010 Design of the CHIRON high-resolution spectrometer at CTIO
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Small telescopes coupled to high resolution spectrometers are powerful tools for Doppler planet searches. They allow for high cadence observations and flexible scheduling; yet there are few such facilities. We present an innovative and inexpensive design for CHIRON, a high resolution (R~80.000) Echelle spectrometer for the 1.5m telescope at CTIO. Performance and throughput are very good, over the whole spectral range from 410 to 870nm, with a peak efficiency of 15% in the iodine absorption region. The spectrograph will be fibre-fed, and use an iodine cell for wavelength calibration. An image slicer permits a moderate beam size. We use commercially available, high performance optical components, which is key for quick and efficient implementation. We discuss the optical design, opto-mechanical tolerances and resulting image quality.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Schwab, Julien F. P. Spronck, Andrei Tokovinin, and Debra A. Fischer "Design of the CHIRON high-resolution spectrometer at CTIO", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77354G (20 July 2010); doi: 10.1117/12.856709; https://doi.org/10.1117/12.856709

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