Performance of the CHIRON high-resolution Echelle spectrograph

Christian Schwab*, Julien F P Spronck, Andrei Tokovinin, Andrew Szymkowiak, Matthew Giguere, Debra A. Fischer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

8 Citations (Scopus)


CHIRON is a fiber-fed Echelle spectrograph with observing modes for resolutions from 28,000 to 120,000, built primarily for measuring precise radial velocities (RVs). We present the instrument performance as determined during integration and commissioning. We discuss the PSF, the effect of glass inhomogeneity on the cross-dispersion prism, temperature stabilization, stability of the spectrum on the CCD, and detector characteristics. The RV precision is characterized, with an iodine cell or a ThAr lamp as the wavelength reference. Including all losses from the sky to the detector, the overall efficiency is about 6%; the dominant limitation is coupling losses into the fiber due to poor guiding.

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy IV
EditorsIan S. McLean, Suzanne K. Ramsay, Hideki Takami
Place of PublicationBellingham, WA
Number of pages16
ISBN (Print)9780819491473
Publication statusPublished - 2012
Externally publishedYes
EventGround-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands
Duration: 1 Jul 20126 Jul 2012


OtherGround-Based and Airborne Instrumentation for Astronomy IV


  • Doppler method
  • Echelle
  • Exoplanets
  • Fiber-fed spectrograph
  • Iodine cell
  • Radial velocities
  • Spectroscopy


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