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Proceedings Paper

On-sky operations with the ALES integral field spectrograph
Author(s): Jordan M. Stone; Andrew J. Skemer; Philip Hinz; Zack Briesemeister; Travis Barman; Charles E. Woodward; Mike Skrutskie; Jarron Leisenring
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Paper Abstract

The integral field spectrograph configuration of the LMIRCam science camera within the Large Binocular Telescope Interferometer (LBTI) facilitates 2 to 5 µm spectroscopy of directly imaged gas-giant exoplanets. The mode, dubbed ALES, comprises magnification optics, a lenslet array, and direct-vision prisms, all of which are included within filter wheels in LMIRCam. Our observing approach includes manual adjustments to filter wheel positions to optimize alignment, on/off nodding to track sky-background variations, and wavelength calibration using narrow band filters in series with ALES optics. For planets with separations outside our 1”x1” field of view, we use a three-point nod pattern to visit the primary, secondary and sky. To minimize overheads we select the longest exposure times and nod periods given observing conditions, especially sky brightness and variability. Using this strategy we collected several datasets of low-mass companions to nearby stars.

Paper Details

Date Published: 6 July 2018
PDF: 12 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107023F (6 July 2018); doi: 10.1117/12.2313977
Show Author Affiliations
Jordan M. Stone, Steward Observatory, The Univ. of Arizona (United States)
Andrew J. Skemer, Univ. of California, Santa Cruz (United States)
Philip Hinz, Steward Observatory, The Univ. of Arizona (United States)
Zack Briesemeister, Univ. of California, Santa Cruz (United States)
Travis Barman, The Univ. of Arizona (United States)
Charles E. Woodward, Univ. of Minnesota, Twin Cities (United States)
Mike Skrutskie, Univ. of Virginia (United States)
Jarron Leisenring, Steward Observatory, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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