The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept

Michael J. Ireland; Stuart Barnes; David Cochrane; Matthew Colless; Peter Connor; Anthony Horton; Steve Gibson; Jon Lawrence; Sarah Martell; Peter McGregor; Tom Nicolle; Kathryn Nield; David Orr; J. Gordon Robertson; Stuart Ryder; Andrew Sheinis; Greg Smith; Nick Staszak; Julia Tims; Pascal Xavier; Peter Young; Jessica Zheng

doi:10.1117/12.925746

The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept

Michael J. Ireland^*, Stuart Barnes, David Cochrane, Matthew Colless, Peter Connor, Anthony Horton, Steve Gibson, Jon Lawrence, Sarah Martell, Peter McGregor, Tom Nicolle, Kathryn Nield, David Orr, J. Gordon Robertson, Stuart Ryder, Andrew Sheinis, Greg Smith, Nick Staszak, Julia Tims, Pascal XavierPeter Young, Jessica Zheng

^*Corresponding author for this work

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

16 Citations (Scopus)

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Abstract

The Gemini High-Resolution Optical SpecTrograph (GHOST) will fill an important gap in the current suite of Gemini instruments. We will describe the Australian Astronomical Observatory (AAO)-led concept for GHOST, which consists of a multi-object, compact, high-efficiency, fixed-format, fiber-fed design. The spectrograph itself is a four-arm variant of the asymmetric white-pupil echelle Kiwispec spectrograph, Kiwisped, produced by Industrial Research Ltd. This spectrograph has an R4 grating and a 100mm pupil, and separate cross-disperser and camera optics for each of the four arms, carefully optimized for their respective wavelength ranges. We feed this spectrograph with a miniature lenslet-based IFU that sub-samples the seeing disk of a single object into 7 hexagonal sub-images, reformatting this into a slit with a second set of double microlenses at the spectrograph entrance with relatively little loss due to focal-ratio degradation. This reformatting enables high spectral resolution from a compact design that fits well within the relatively tight GHOST budget. We will describe our baseline 2-object R∼50,000 design with full wavelength coverage from the ultraviolet to the silicon cutoff, as well as the high-resolution single-object R∼75,000 mode.

Original language	English
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy IV
Subtitle of host publication	Proceedings of SPIE Vol. 8446
Editors	Ian S. McLean, Suzanne K. Ramsay, Hideki Takami
Place of Publication	Bellingham, Washington
Publisher	SPIE
Pages	1-13
Number of pages	13
Volume	8446
ISBN (Print)	9780819491473
DOIs	https://doi.org/10.1117/12.925746
Publication status	Published - 2012
Event	Ground-Based and Airborne Instrumentation for Astronomy IV - Amsterdam, Netherlands Duration: 1 Jul 2012 → 6 Jul 2012

Other

Other	Ground-Based and Airborne Instrumentation for Astronomy IV
Country/Territory	Netherlands
City	Amsterdam
Period	1/07/12 → 6/07/12

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Ireland, M. J., Barnes, S., Cochrane, D., Colless, M., Connor, P., Horton, A., Gibson, S., Lawrence, J., Martell, S., McGregor, P., Nicolle, T., Nield, K., Orr, D., Robertson, J. G., Ryder, S., Sheinis, A., Smith, G., Staszak, N., Tims, J., ... Zheng, J. (2012). The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept. In I. S. McLean, S. K. Ramsay, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy IV: Proceedings of SPIE Vol. 8446 (Vol. 8446, pp. 1-13). Article 844629 SPIE. https://doi.org/10.1117/12.925746

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title = "The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept",

abstract = "The Gemini High-Resolution Optical SpecTrograph (GHOST) will fill an important gap in the current suite of Gemini instruments. We will describe the Australian Astronomical Observatory (AAO)-led concept for GHOST, which consists of a multi-object, compact, high-efficiency, fixed-format, fiber-fed design. The spectrograph itself is a four-arm variant of the asymmetric white-pupil echelle Kiwispec spectrograph, Kiwisped, produced by Industrial Research Ltd. This spectrograph has an R4 grating and a 100mm pupil, and separate cross-disperser and camera optics for each of the four arms, carefully optimized for their respective wavelength ranges. We feed this spectrograph with a miniature lenslet-based IFU that sub-samples the seeing disk of a single object into 7 hexagonal sub-images, reformatting this into a slit with a second set of double microlenses at the spectrograph entrance with relatively little loss due to focal-ratio degradation. This reformatting enables high spectral resolution from a compact design that fits well within the relatively tight GHOST budget. We will describe our baseline 2-object R∼50,000 design with full wavelength coverage from the ultraviolet to the silicon cutoff, as well as the high-resolution single-object R∼75,000 mode.",

author = "Ireland, {Michael J.} and Stuart Barnes and David Cochrane and Matthew Colless and Peter Connor and Anthony Horton and Steve Gibson and Jon Lawrence and Sarah Martell and Peter McGregor and Tom Nicolle and Kathryn Nield and David Orr and Robertson, {J. Gordon} and Stuart Ryder and Andrew Sheinis and Greg Smith and Nick Staszak and Julia Tims and Pascal Xavier and Peter Young and Jessica Zheng",

year = "2012",

doi = "10.1117/12.925746",

language = "English",

isbn = "9780819491473",

volume = "8446",

pages = "1--13",

editor = "McLean, {Ian S.} and Ramsay, {Suzanne K.} and Hideki Takami",

booktitle = "Ground-Based and Airborne Instrumentation for Astronomy IV",

publisher = "SPIE",

address = "United States",

note = "Ground-Based and Airborne Instrumentation for Astronomy IV ; Conference date: 01-07-2012 Through 06-07-2012",

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Ireland, MJ, Barnes, S, Cochrane, D, Colless, M, Connor, P, Horton, A, Gibson, S, Lawrence, J, Martell, S, McGregor, P, Nicolle, T, Nield, K, Orr, D, Robertson, JG, Ryder, S, Sheinis, A, Smith, G, Staszak, N, Tims, J, Xavier, P, Young, P & Zheng, J 2012, The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept. in IS McLean, SK Ramsay & H Takami (eds), Ground-Based and Airborne Instrumentation for Astronomy IV: Proceedings of SPIE Vol. 8446. vol. 8446, 844629, SPIE, Bellingham, Washington, pp. 1-13, Ground-Based and Airborne Instrumentation for Astronomy IV, Amsterdam, Netherlands, 1/07/12. https://doi.org/10.1117/12.925746

The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept. / Ireland, Michael J.; Barnes, Stuart; Cochrane, David et al.
Ground-Based and Airborne Instrumentation for Astronomy IV: Proceedings of SPIE Vol. 8446. ed. / Ian S. McLean; Suzanne K. Ramsay; Hideki Takami. Vol. 8446 Bellingham, Washington: SPIE, 2012. p. 1-13 844629.

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

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AU - Ireland, Michael J.

AU - Barnes, Stuart

AU - Cochrane, David

AU - Colless, Matthew

AU - Connor, Peter

AU - Horton, Anthony

AU - Gibson, Steve

AU - Lawrence, Jon

AU - Martell, Sarah

AU - McGregor, Peter

AU - Nicolle, Tom

AU - Nield, Kathryn

AU - Orr, David

AU - Robertson, J. Gordon

AU - Ryder, Stuart

AU - Sheinis, Andrew

AU - Smith, Greg

AU - Staszak, Nick

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AU - Xavier, Pascal

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AU - Zheng, Jessica

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AB - The Gemini High-Resolution Optical SpecTrograph (GHOST) will fill an important gap in the current suite of Gemini instruments. We will describe the Australian Astronomical Observatory (AAO)-led concept for GHOST, which consists of a multi-object, compact, high-efficiency, fixed-format, fiber-fed design. The spectrograph itself is a four-arm variant of the asymmetric white-pupil echelle Kiwispec spectrograph, Kiwisped, produced by Industrial Research Ltd. This spectrograph has an R4 grating and a 100mm pupil, and separate cross-disperser and camera optics for each of the four arms, carefully optimized for their respective wavelength ranges. We feed this spectrograph with a miniature lenslet-based IFU that sub-samples the seeing disk of a single object into 7 hexagonal sub-images, reformatting this into a slit with a second set of double microlenses at the spectrograph entrance with relatively little loss due to focal-ratio degradation. This reformatting enables high spectral resolution from a compact design that fits well within the relatively tight GHOST budget. We will describe our baseline 2-object R∼50,000 design with full wavelength coverage from the ultraviolet to the silicon cutoff, as well as the high-resolution single-object R∼75,000 mode.

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ER -

The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept

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