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Type: Journal article
Title: Laser frequency comb techniques for precise astronomical spectroscopy
Author: Murphy, M.
Locke, C.
Light, P.
Luiten, A.
Lawrence, J.
Citation: Monthly Notices of the Royal Astronomical Society, 2012; 422(1):761-771
Publisher: Oxford University Press (OUP)
Issue Date: 2012
ISSN: 0035-8711
Statement of
Michael T. Murphy, Clayton R. Locke, Philip S. Light, Andre N. Luiten and Jon S. Lawrence
Abstract: Precise astronomical spectroscopic analyses routinely assume that individual pixels in charge-coupled devices (CCDs) have uniform sensitivity to photons. Intra-pixel sensitivity (IPS) variations may already cause small systematic errors in, for example, studies of extra-solar planets via stellar radial velocities and cosmological variability in fundamental constants via quasar spectroscopy, but future experiments requiring velocity precisions approaching ∼1cm s−1 will be more strongly affected. Laser frequency combs have been shown to provide highly precise wavelength calibration for astronomical spectrographs, but here we show that they can also be used to measure IPS variations in astronomical CCDs in situ. We successfully tested a laser frequency comb system on the Ultra-High-Resolution Facility spectrograph at the Anglo-Australian Telescope. By modelling the two-dimensional comb signal recorded in a single CCD exposure, we find that the average IPS deviates by <8 percent if it is assumed to vary symmetrically about the pixel centre. We also demonstrate that a series of comb exposures with absolutely known offsets between them can yield tighter constraints on symmetric IPS variations from ∼100 pixels. We discuss measurement of asymmetric IPS variations and absolute wavelength calibration of astronomical spectrographs and CCDs using frequency combs.
Keywords: instrumentation: detectors; instrumentation: spectrographs; methods: laboratory; techniques: spectroscopic
Rights: © 2012 The Authors
RMID: 0030008455
DOI: 10.1111/j.1365-2966.2012.20656.x
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Appears in Collections:Physics publications

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