TY - GEN
T1 - The AAO's Gemini High-resolution Optical SpecTrograph (GHOST) concept
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
AU - Tims, Julia
AU - Xavier, Pascal
AU - Young, Peter
AU - Zheng, Jessica
PY - 2012
Y1 - 2012
N2 - 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.
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.
KW - Echelle
KW - High resolution
KW - Radial velocity
KW - Spectrograph
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=84871986623&partnerID=8YFLogxK
U2 - 10.1117/12.925746
DO - 10.1117/12.925746
M3 - Conference contribution
SN - 9780819491473
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Ground-Based and Airborne Instrumentation for Astronomy IV
T2 - Ground-Based and Airborne Instrumentation for Astronomy IV
Y2 - 1 July 2012 through 6 July 2012
ER -