Publications of the Astronomical Society of the Pacific· 2013Q1
CHIRON—A Fiber Fed Spectrometer for Precise Radial Velocities
- 294citations
- Q1SCImago
- 2013year
Short summary
The CHIRON echelle spectrometer, commissioned in 2011, achieves high precision radial velocity monitoring of bright stars for exoplanet discovery, reaching R=79,000 with 6% efficiency or R=136,000 for brighter targets.
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Key points
- CHIRON is an optical high-resolution echelle spectrometer commissioned in 2011 at CTIO.
- It targets high precision and high cadence radial velocity monitoring of bright stars for exoplanet discovery.
- Spectral resolutions of R=79,000 (with >=6% efficiency) and R=136,000 are achievable.
- The instrument covers a spectral range of 415 to 880 nm and is temperature-stabilized to +-0.2deg.
- A vacuum-housed echelle grating, stable fiber feed, and iodine cell are key components.
AI-generated from the title and abstract; the full text is not read.
Abstract
The CHIRON optical high-resolution echelle spectrometer was commissioned at the 1.5m telescope at CTIO in 2011. The instrument was designed for high throughput and stability, with the goal of monitoring radial velocities of bright stars with high precision and high cadence for the discovery of low-mass exoplanets. Spectral resolution of R=79,000 is attained when using a slicer with a total (including telescope and detector) efficiency of 6% or higher, while a resolution of R=136,000 is available for bright stars. A fixed spectral range of 415 to 880 nm is covered. The echelle grating is housed in a vacuum enclosure and the instrument temperature is stabilized to +-0.2deg. Stable illumination is provided by an octagonal multimode fiber with excellent light-scrambling properties. An iodine cell is used for wavelength calibration. We describe the main optics, fiber feed, detector, exposure-meter, and other aspects of the instrument, as well as the observing procedure and data reduction.
The authors' abstract, as published at the source. Publications of the Astronomical Society of the Pacific, 2013 · DOI ↗
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Field: Instrumentation
InstrumentationPhysics and Astronomy