A direct measurement of atmospheric dispersion in N-band spectra: Implications for mid-IR systems on ELTs

Andrew J. Škemer, Philip M. Hinz, William F. Hoffmann, Laird M. Close, Sarah Kendrew, Richard J. Mathar, Remko Stuik, Thomas P. Greene, Charles E. Woodward, Michael S. Kelley

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Adaptive optics will almost completely remove the effects of atmospheric turbulence at 10 //m on the Extremely Large Telescope (ELT) generation of telescopes. In this article, we observationally confirm that the next most important limitation to image quality is atmospheric dispersion, rather than telescope diffraction. By using the 6.5 m MMT with its unique mid-IR adaptive optics system, we measure atmospheric dispersion in the N band with the newly commissioned spectroscopic mode on MIRAC4-BLINC. Our results indicate that atmospheric dispersion is generally linear in the N band, although there is some residual curvature. We compare our measurements to theory, and make predictions for ELT Strehls and image FHWM with and without an atmospheric dispersion corrector (ADC). We find that for many mid-IR applications, an ADC will be necessary on ELTs.

Original languageEnglish (US)
Pages (from-to)897-904
Number of pages8
JournalPublications of the Astronomical Society of the Pacific
Volume121
Issue number882
DOIs
StatePublished - Aug 1 2009

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Škemer, A. J., Hinz, P. M., Hoffmann, W. F., Close, L. M., Kendrew, S., Mathar, R. J., Stuik, R., Greene, T. P., Woodward, C. E., & Kelley, M. S. (2009). A direct measurement of atmospheric dispersion in N-band spectra: Implications for mid-IR systems on ELTs. Publications of the Astronomical Society of the Pacific, 121(882), 897-904. https://doi.org/10.1086/605312