Initial results from the usno dispersed fourier transform spectrograph

Arsen R. Hajian, Bradford B. Behr, Andrew T. Cenko, Robert P. Olling, David Mozurkewich, J. Thomas Armstrong, Brian Pohl, Sevan Petrossian, Kevin H. Knuth, Robert B. Hindsley, Marc Murison, Michael Efroimsky, Ronald Dantowitz, Marek Kozubal, Douglas G. Currie, Tyler E. Nordgren, Christopher Tycner, Robert S. McMillan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish
Pages (from-to)616-633
Number of pages18
JournalAstrophysical Journal
Issue number1 I
StatePublished - May 20 2007


  • Binaries: spectroscopic
  • Instrumentation: interferometers
  • Instrumentation: spectrographs
  • Planetary systems
  • Techniques: interferometric


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