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Proceedings Article

Gemini planet imager observational calibration XIII: wavelength calibration improvements, stability, and nonlinearity

[+] Author Affiliations
Schuyler G. Wolff, Alex Z. Greenbaum

Johns Hopkins Univ. (United States)

Kimberly Ward-Duong

Arizona State Univ. (United States)

Joe Zalesky, James Graham

Univ. of California, Berkeley (United States)

Marshall D. Perrin

Space Telescope Science Institute (United States)

Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990838 (August 9, 2016); doi:10.1117/12.2233644
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From Conference Volume 9908

  • Ground-based and Airborne Instrumentation for Astronomy VI
  • Christopher J. Evans; Luc Simard; Hideki Takami
  • Edinburgh, United Kingdom | June 26, 2016

abstract

We present improvements to the wavelength calibration for the lenslet-based Integral Field Spectrograph (IFS), that serves as the science instrument for the Gemini Planet Imager (GPI). The GPI IFS features a 2.7”×2.7” field of view and a 190 x 190 lenslet array (14.1 mas/lenslet) with spectral resolving power ranging from R ~ 35 to 78. A unique wavelength solution is determined for each lenslet characterized by a two-dimensional position, an n-dimensional polynomial describing the spectral dispersion, and the rotation of the spectrum with respect to the detector axis. We investigate the non-linearity of the spectral dispersion across all Y, J, H, and K bands through both on-sky arc lamp images and simulated IFS images using a model of the optical path. Additionally, the 10-hole non-redundant masking mode on GPI provides an alternative measure of wavelength dispersion within a datacube by cross-correlating reference PSFs with science images. This approach can be used to confirm deviations from linear dispersion in the reduced datacubes. We find that the inclusion of a quadratic term provides a factor of 10 improvement in wavelength solution accuracy over the linear solution and is necessary to achieve uncertainties of a few hundredths of a pixel in J band to a few thousands of a pixel in the K bands. This corresponds to a wavelength uncertainty of ~ 0.2 nm across all filters. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Schuyler G. Wolff ; Kimberly Ward-Duong ; Joe Zalesky ; Alex Z. Greenbaum ; Marshall D. Perrin, et al.
" Gemini planet imager observational calibration XIII: wavelength calibration improvements, stability, and nonlinearity ", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990838 (August 9, 2016); doi:10.1117/12.2233644; http://dx.doi.org/10.1117/12.2233644


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