Initial Results from the USNO Dispersed Fourier Transform Spectrograph
Abstract
We have designed and constructed a ``dispersed Fourier Transform Spectrometer'' (dFTS), consisting of a conventional FTS followed by a grating spectrometer. By combining these two devices, we negate a substantial fraction of the sensitivity disadvantage of a conventional FTS for high resolution, broadband, optical spectroscopy, while preserving many of the advantages inherent to interferometric spectrometers. In addition, we have implemented a simple and inexpensive laser metrology system, which enables very precise calibration of the interferometer wavelength scale. The fusion of interferometric and dispersive technologies with a laser metrology system yields an instrument well-suited to stellar spectroscopy, velocimetry, and extrasolar planet detection, which is competitive with existing high-resolution, high accuracy stellar spectrometers. In this paper, we describe the design of our prototype dFTS, explain the algorithm we use to efficiently reconstruct a broadband spectrum from a sequence of narrowband interferograms, and present initial observations and resulting velocimetry of stellar targets.
Cite
@article{arxiv.astro-ph/0611495,
title = {Initial Results from the USNO Dispersed Fourier Transform Spectrograph},
author = {Arsen R. Hajian and Bradford B. Behr and Andrew T. Cenko and Robert P. Olling and David Mozurkewich and J. Thomas Armstrong and Brian Pohl and Sevan Petrossian and Kevin H. Knuth and Robert B. Hindsley and Marc Murison and Michael Efroimsky and Ronald Dantowitz and Marek Kozubal and Douglas G. Currie and Tyler E. Nordgren and Christopher Tycner and Robert S. McMillan},
journal= {arXiv preprint arXiv:astro-ph/0611495},
year = {2008}
}