MEAD: data reduction pipeline for ALES integral field spectrograph and LBTI thermal infrared calibration unit

Zackery Briesemeister; Andrew J. Skemer; Jordan M. Stone; R. Deno Stelter; Philip Hinz; Jarron Leisenring; Michael F. Skrutskie; Charles E. Woodward; Travis Barman

doi:10.1117/12.2312859

6 July 2018 MEAD: data reduction pipeline for ALES integral field spectrograph and LBTI thermal infrared calibration unit

Zackery Briesemeister, Andrew J. Skemer, Jordan M. Stone, R. Deno Stelter, Philip Hinz, Jarron Leisenring, Michael F. Skrutskie, Charles E. Woodward, Travis Barman

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107022Q (2018) https://doi.org/10.1117/12.2312859
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

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.

Citation Download Citation

Zackery Briesemeister, Andrew J. Skemer, Jordan M. Stone, R. Deno Stelter, Philip Hinz, Jarron Leisenring, Michael F. Skrutskie, Charles E. Woodward, and Travis Barman "MEAD: data reduction pipeline for ALES integral field spectrograph and LBTI thermal infrared calibration unit", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107022Q (6 July 2018); https://doi.org/10.1117/12.2312859

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