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Proceedings Paper

Ground layer adaptive optics for the W. M. Keck Observatory: feasibility study
Author(s): J. R. Lu; M. Chun; S. M. Ammons; K. Bundy; R. Dekany; T. Do; D. Gavel; M. Kassis; O. Lai; C. L. Martin; C. Max; C. Steidel; L. Wang; K. Westfall; P. Wizinowich
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Paper Abstract

Ground-layer adaptive optics (GLAO) systems offer the possibility of improving the ”seeing” of large ground-based telescopes and increasing the efficiency and sensitivity of observations over a wide field-of-view. We explore the utility and feasibility of deploying a GLAO system at the W. M. Keck Observatory in order to feed existing and future multi-object spectrographs and wide-field imagers. We also briefly summarize science cases spanning exoplanets to high-redshift galaxy evolution that would benefit from a Keck GLAO system. Initial simulations indicate that a Keck GLAO system would deliver a 1.5x and 2x improvement in FWHM at optical (500 nm) and infrared (1.5 μm), respectively. The infrared instrument, MOSFIRE, is ideally suited for a Keck GLAO feed in that it has excellent image quality and is on the telescope’s optical axis. However, it lacks an atmospheric dispersion compensator, which would limit the minimum usable slit size for long-exposure science cases. Similarly, while LRIS and DEIMOS may be able to accept a GLAO feed based on their internal image quality, they lack either an atmospheric dispersion compensator (DEIMOS) or flexure compensation (LRIS) to utilize narrower slits matched to the GLAO image quality. However, some science cases needing shorter exposures may still benefit from Keck GLAO and we will investigate the possibility of installing an ADC.

Paper Details

Date Published: 10 July 2018
PDF: 8 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107030N (10 July 2018); doi: 10.1117/12.2314417
Show Author Affiliations
J. R. Lu, Univ. of California, Berkeley (United States)
M. Chun, Institute for Astronomy, Univ. of Hawaii (United States)
S. M. Ammons, Lawrence Livermore National Lab. (United States)
K. Bundy, Univ. of California Observatories (United States)
R. Dekany, Caltech Optical Observatories (United States)
T. Do, Univ. of California, Los Angeles (United States)
D. Gavel, Univ. of California Observatories (United States)
M. Kassis, W. M. Keck Observatory (United States)
O. Lai, Observatoire de la Côte d'Azur, CNRS (France)
C. L. Martin, Univ. of California, Santa Barbara (United States)
C. Max, Univ. of California Observatories (United States)
Univ. of California, Santa Cruz (United States)
C. Steidel, Caltech (United States)
L. Wang, Thirty Meter Telescope (United States)
K. Westfall, Univ. of California, Santa Cruz (United States)
P. Wizinowich, W. M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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