Design of the CHIRON high-resolution spectrometer at CTIO

Christian Schwab; Julien F. P. Spronck; Andrei Tokovinin; Debra A. Fischer

doi:10.1117/12.856709

20 July 2010 Design of the CHIRON high-resolution spectrometer at CTIO

Christian Schwab, Julien F. P. Spronck, Andrei Tokovinin, Debra A. Fischer

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77354G (2010) https://doi.org/10.1117/12.856709
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.856709

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