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Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph

Erskine, David J. and Edelstein, J. and Muirhead, P. and Muterspaugh, M. and Covey, K. and Mondo, D. and Vanderburg, A. and Anderson, P. and Kimber, D. and Sirk, M. and Lloyd, J. (2011) Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph. In: UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V. Proceedings of SPIE. No.8146. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 81460M. ISBN 978-0-8194-8756-8. https://resolver.caltech.edu/CaltechAUTHORS:20161028-125830589

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Abstract

An optical technique called "interferometric spectral reconstruction" (ISR) is capable of increasing a spectrograph's resolution and stability by large factors, well beyond its classical limits. We have demonstrated a 6- to 11-fold increase in the Triplespec effective spectral resolution (R=2,700) to achieve R=16,000 at 4100 cm-^(1) to 30,000 at 9600 cm^(-1) by applying special Fourier processing to a series of exposures with different delays (optical path differences) taken with the TEDI interferometer and the near-infrared Triplespec spectrograph at the Mt. Palomar Observatory 200 inch telescope. The TEDI is an externally dispersed interferometer (EDI) used for Doppler radial velocity measurements on M-stars, and now also used for ISR. The resolution improvement is observed in both stellar and telluric features simultaneously over the entire spectrograph bandwidth (0.9-2.45 μm). By expanding the delay series, we anticipate achieving resolutions of R=45,000 or more. Since the delay is not continuously scanned, the technique is advantageous for measuring time-variable phenomena or in varying conditions (e.g. planetary fly-bys). The photon limited signal to noise ratio can be 100 times better than a classic Fourier Transform Spectrometer (FTS) due to the benefit of dispersion.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.892664DOIArticle
ORCID:
AuthorORCID
Muirhead, P.0000-0002-0638-8822
Covey, K.0000-0001-6914-7797
Vanderburg, A.0000-0001-7246-5438
Additional Information:© 2011 SPIE. This material is based upon work supported by the National Science Foundation under Grant No. AST-0505366, AST-096064, NASA Grant NNX09AB38G, and by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Thanks to Ed Wishnow for molecular spectra calculations and valuable advice over the years. Thanks to Palomar Observatory and UC Berkeley Space Sciences staff including Mario Marckwordt, Michael Feuerstein, and Gregory Dalton. Thanks to Triplespec PI Terry Herter and Cornell staff Charles Henderson and Stephen Parshley. Travis Barman provided high-res model stellar spectrum used in TEDI performance simulations.
Funders:
Funding AgencyGrant Number
NSFAST-0505366
NSFAST-096064
NASANNX09AB38G
Department of Energy (DOE)DE-AC52-07NA27344
Subject Keywords:High resolution spectroscopy, Externally Dispersed Interferometry, Dispersed Fixed Delay Interferometry, Resolution Boosting, Doppler radial velocimetry, Fourier Transform Spectroscopy
Series Name:Proceedings of SPIE
Issue or Number:8146
Record Number:CaltechAUTHORS:20161028-125830589
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161028-125830589
Official Citation:David J. Erskine ; J. Edelstein ; P. Muirhead ; M. Muterspaugh ; K. Covey ; D. Mondo ; A. Vanderburg ; P. Andelson ; D. Kimber ; M. Sirk ; J. Lloyd; Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph. Proc. SPIE 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, 81460M (September 14, 2011); doi:10.1117/12.892664
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71579
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Oct 2016 20:37
Last Modified:02 Nov 2019 03:11

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