On-sky operations with the ALES integral field spectrograph

Jordan M. Stone; Andrew J. Skemer; Philip Hinz; Zack Briesemeister; Travis Barman; Charles E. Woodward; Mike Skrutskie; Jarron Leisenring

doi:10.1117/12.2313977

On-sky operations with the ALES integral field spectrograph

Jordan M. Stone, Andrew J. Skemer, Philip Hinz, Zack Briesemeister, Travis Barman, Charles E. Woodward, Mike Skrutskie, Jarron Leisenring

Physics and Astronomy (Twin Cities)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

8 Scopus citations

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.

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
Publisher	SPIE
ISBN (Print)	9781510619579
DOIs	https://doi.org/10.1117/12.2313977
State	Published - 2018
Event	Ground-based and Airborne Instrumentation for Astronomy VII 2018 - Austin, United States Duration: Jun 10 2018 → Jun 14 2018

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	10702
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Other

Other	Ground-based and Airborne Instrumentation for Astronomy VII 2018
Country/Territory	United States
City	Austin
Period	6/10/18 → 6/14/18

Bibliographical note

Funding Information:
The authors acknowledge support from NSF Collaborative Research grant 1608834. JMS is supported by NASA through Hubble Fellowship grant HST-HF2-51398.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. 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; Is-tituto Nazionale di Astrofisica, Italy; LBT Beteiligungs-gesellschaft, 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.

Publisher Copyright:
© 2018 SPIE.

Keywords

Exoplanet Characterization
High-Contrast
Integral Field Spectroscopy

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10.1117/12.2313977

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Cite this

Stone, J. M., Skemer, A. J., Hinz, P., Briesemeister, Z., Barman, T., Woodward, C. E., Skrutskie, M., & Leisenring, J. (2018). On-sky operations with the ALES integral field spectrograph. In L. Simard, L. Simard, C. J. Evans, & H. Takami (Eds.), Ground-based and Airborne Instrumentation for Astronomy VII Article 107023F (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10702). SPIE. https://doi.org/10.1117/12.2313977

On-sky operations with the ALES integral field spectrograph. / Stone, Jordan M.; Skemer, Andrew J.; Hinz, Philip et al.
Ground-based and Airborne Instrumentation for Astronomy VII. ed. / Luc Simard; Luc Simard; Christopher J. Evans; Hideki Takami. SPIE, 2018. 107023F (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10702).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Stone, JM, Skemer, AJ, Hinz, P, Briesemeister, Z, Barman, T, Woodward, CE, Skrutskie, M & Leisenring, J 2018, On-sky operations with the ALES integral field spectrograph. in L Simard, L Simard, CJ Evans & H Takami (eds), Ground-based and Airborne Instrumentation for Astronomy VII., 107023F, Proceedings of SPIE - The International Society for Optical Engineering, vol. 10702, SPIE, Ground-based and Airborne Instrumentation for Astronomy VII 2018, Austin, United States, 6/10/18. https://doi.org/10.1117/12.2313977

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N2 - 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.

AB - 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.

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ER -

On-sky operations with the ALES integral field spectrograph

Abstract

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Bibliographical note

Keywords

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