Imaging, Spectroscopic, High-Contrast, and Interferometric Instrumentation

High-resolution broadband spectroscopy using externally dispersed interferometry at the Hale telescope: Part 1, data analysis and results

[+] Author Affiliations
David J. Erskine

Lawrence Livermore National Laboratory, Mailstop L-487, 7000 East Avenue, Livermore, California 94550, United States

Jerry Edelstein, Edward H. Wishnow, Martin Sirk, Yuzo Ishikawa, Eliza A. McDonald, William V. Shourt

University of California, Space Sciences Laboratory, 7 Gauss Way, Berkeley, California 94720, United States

Philip S. Muirhead

Boston University, Department of Astronomy, 725 Commonwealth Avenue, Boston, Massachusetts 02215, United States

Matthew W. Muterspaugh

Tennessee State University, Boswell Science Hall, Nashville, Tennessee 37209, United States

James P. Lloyd

Cornell University, Carl Sagan Institute, Astronomy Department, 230 Space Sciences, Ithaca, New York 14853, United States

Andrew M. Vanderburg

Harvard Smithsonian Center for Astrophysics, 60 Garden Street, MS-10, Cambridge, Massachusetts 02138, United States

J. Astron. Telesc. Instrum. Syst. 2(2), 025004 (May 27, 2016). doi:10.1117/1.JATIS.2.2.025004
History: Received November 8, 2015; Accepted April 27, 2016
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Abstract.  High-resolution broadband spectroscopy at near-infrared wavelengths (950 to 2450 nm) has been performed using externally dispersed interferometry (EDI) at the Hale telescope at Mt. Palomar. Observations of stars were performed with the “TEDI” interferometer mounted within the central hole of the 200-in. primary mirror in series with the comounted TripleSpec near-infrared echelle spectrograph. These are the first multidelay EDI demonstrations on starlight, as earlier measurements used a single delay or laboratory sources. We demonstrate very high (10×) resolution boost, from original 2700 to 27,000 with current set of delays (up to 3 cm), well beyond the classical limits enforced by the slit width and detector pixel Nyquist limit. Significantly, the EDI used with multiple delays rather than a single delay as used previously yields an order of magnitude or more improvement in the stability against native spectrograph point spread function (PSF) drifts along the dispersion direction. We observe a dramatic (20×) reduction in sensitivity to PSF shift using our standard processing. A recently realized method of further reducing the PSF shift sensitivity to zero is described theoretically and demonstrated in a simple simulation which produces a 350× times reduction. We demonstrate superb rejection of fixed pattern noise due to bad detector pixels—EDI only responds to changes in pixel intensity synchronous to applied dithering. This part 1 describes data analysis, results, and instrument noise. A section on theoretical photon limited sensitivity is in a companion paper, part 2.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

David J. Erskine ; Jerry Edelstein ; Edward H. Wishnow ; Martin Sirk ; Philip S. Muirhead, et al.
"High-resolution broadband spectroscopy using externally dispersed interferometry at the Hale telescope: Part 1, data analysis and results", J. Astron. Telesc. Instrum. Syst. 2(2), 025004 (May 27, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.2.025004


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