We present the data reduction pipeline, MEAD, for Arizona Lenslets for Exoplanet Spectroscopy (ALES), the first thermal infrared integral field spectrograph designed for high-contrast imaging. ALES is an upgrade of LMIRCam, the 1 - 5 μm imaging camera for the Large Binocular Telescope, capable of observing astronomical objects in the thermal infrared (3 - 5 μm) to produce simultaneous spatial and spectral data cubes. The pipeline is currently designed to perform L-band (2.8 - 4.2 μm) data cube reconstruction, relying on methods used extensively by current near-infrared integral field spectrographs. ALES data cube reconstruction on each spectra uses an optimal extraction method. The calibration unit comprises a thermal infrared source, a monochromator and an optical diffuser designed to inject specific wavelengths of light into LBTI to evenly illuminate the pupil plane and ALES lenslet array with monochromatic light. Not only does the calibration unit facilitate wavelength calibration for ALES and LBTI, but it also provides images of monochromatic point spread functions (PSFs). A linear combination of these monochromatic PSFs can be optimized to fit each spectrum in the least-square sense via x2 fitting.
|Original language||English (US)|
|Title of host publication||Ground-based and Airborne Instrumentation for Astronomy VII|
|Editors||Luc Simard, Luc Simard, Christopher J. Evans, Hideki Takami|
|State||Published - 2018|
|Event||Ground-based and Airborne Instrumentation for Astronomy VII 2018 - Austin, United States|
Duration: Jun 10 2018 → Jun 14 2018
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Other||Ground-based and Airborne Instrumentation for Astronomy VII 2018|
|Period||6/10/18 → 6/14/18|
Bibliographical noteFunding Information:
The LBT is an international collaboration among institutions in the United States, Italy and Germany. LBT Corporation partners are: The University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia. This paper is based on work funded by NSF Grants 1608834 and 1614320.
- data processing
- integral field spectroscopy