Initial Results from the USNO Dispersed Fourier Transform Spectrograph

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-resolut...

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Published inThe Astrophysical journal Vol. 661; no. 1; pp. 616 - 633
Main Authors Hajian, Arsen R, Behr, Bradford B, Cenko, Andrew T, Olling, Robert P, Mozurkewich, David, Armstrong, J. Thomas, Pohl, Brian, Petrossian, Sevan, Knuth, Kevin H, Hindsley, Robert B, Murison, Marc, Efroimsky, Michael, Dantowitz, Ronald, Kozubal, Marek, Currie, Douglas G, Nordgren, Tyler E, Tycner, Christopher, McMillan, Robert S
Format Journal Article
LanguageEnglish
Published Chicago, IL IOP Publishing 20.05.2007
University of Chicago Press
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Fourier transformation
planetary systems
binaries: spectroscopic
instrumentation: spectrographs
Planetary system
Spectroscopic binary stars
instrumentation: interferometers
techniques: interferometric
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0004-637X
1538-4357
DOI:10.1086/513181