13 August 2014 Modeling instrumental field-dependent aberrations in the NIRC2 instrument on the Keck II telescope
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Abstract
We present a model of field-dependent aberrations arising in the NIRC2 instrument on the W. M. Keck II telescope. We use high signal-to-noise phase diversity data employing a source in the Nasmyth focal plane to construct a model of the optical path difference as a function of field position and wavelength. With a differential wavefront error of up to 190 nm, this effect is one of the main sources of astrometric and photometric measurement uncertainties. Our tests of temporal stability show sufficient reliability for our measurements over a 20-month period at the field extrema. Additionally, while chromaticity exists, applying a correction for field-dependent aberrations provides overall improvement compared to the existing aberrations present across the field of view.
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Breann N. Sitarski, Breann N. Sitarski, Gunther Witzel, Gunther Witzel, Michael P. Fitzgerald, Michael P. Fitzgerald, Leo Meyer, Leo Meyer, Andrea M. Ghez, Andrea M. Ghez, Randall D. Campbell, Randall D. Campbell, Jessica R. Lu, Jessica R. Lu, Keith Matthews, Keith Matthews, Peter Wizinowich, Peter Wizinowich, Jim Lyke, Jim Lyke, "Modeling instrumental field-dependent aberrations in the NIRC2 instrument on the Keck II telescope", Proc. SPIE 9148, Adaptive Optics Systems IV, 91486T (13 August 2014); doi: 10.1117/12.2057140; https://doi.org/10.1117/12.2057140
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