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Proceedings Paper

The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)
Author(s): Andrew Szentgyorgyi; Daniel Baldwin; Stuart Barnes; Jacob Bean; Sagi Ben-Ami; Patricia Brennan; Jamie Budynkiewicz; Moo-Young Chun; Charlie Conroy; Jeffrey D. Crane; Harland Epps; Ian Evans; Janet Evans; Jeff Foster; Anna Frebel; Thomas Gauron; Dani Guzmán; Tyson Hare; Bi-Ho Jang; Jeong-Gyun Jang; Andres Jordan; Jihun Kim; Kang-Miin Kim; Claudia Mendes Mendes de Oliveira; Mercedes Lopez-Morales; Kenneth McCracken; Stuart McMuldroch; Joseph Miller; Mark Mueller; Jae Sok Oh; Cem Onyuksel; Mark Ordway; Byeong-Gon Park; Chan Park; Sung-Joon Park; Charles Paxson; David Phillips; David Plummer; William Podgorski; Andreas Seifahrt; Daniel Stark; Joao Steiner; Alan Uomoto; Ronald Walsworth; Young-Sam Yu
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Paper Abstract

The GMT-Consortium Large Earth Finder (G-CLEF) will be a cross-dispersed, optical band echelle spectrograph to be delivered as the first light scientific instrument for the Giant Magellan Telescope (GMT) in 2022. G-CLEF is vacuum enclosed and fiber-fed to enable precision radial velocity (PRV) measurements, especially for the detection and characterization of low-mass exoplanets orbiting solar-type stars. The passband of G-CLEF is broad, extending from 3500Å to 9500Å. This passband provides good sensitivity at blue wavelengths for stellar abundance studies and deep red response for observations of high-redshift phenomena. The design of G-CLEF incorporates several novel technical innovations. We give an overview of the innovative features of the current design. G-CLEF will be the first PRV spectrograph to have a composite optical bench so as to exploit that material’s extremely low coefficient of thermal expansion, high in-plane thermal conductivity and high stiffness-to-mass ratio. The spectrograph camera subsystem is divided into a red and a blue channel, split by a dichroic, so there are two independent refractive spectrograph cameras. The control system software is being developed in model-driven software context that has been adopted globally by the GMT. G-CLEF has been conceived and designed within a strict systems engineering framework. As a part of this process, we have developed a analytical toolset to assess the predicted performance of G-CLEF as it has evolved through design phases.

Paper Details

Date Published: 9 August 2016
PDF: 19 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990822 (9 August 2016); doi: 10.1117/12.2233506
Show Author Affiliations
Andrew Szentgyorgyi, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel Baldwin, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stuart Barnes, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jacob Bean, Univ. of Chicago (United States)
Sagi Ben-Ami, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Patricia Brennan, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jamie Budynkiewicz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Charlie Conroy, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jeffrey D. Crane, The Observatories of the Carnegie Institution for Science (United States)
Harland Epps, Lick Observatory, Univ. of California, Santa Cruz (United States)
Ian Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Janet Evans, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jeff Foster, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Anna Frebel, Massachusetts Institute of Technology (United States)
Thomas Gauron, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Dani Guzmán, Pontificia Univ. Católica de Chile (Chile)
Tyson Hare, The Observatories of the Carnegie Institution for Science (United States)
Bi-Ho Jang, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jeong-Gyun Jang, Korea Astronomy and Space Science Institute (Korea, Republic of)
Andres Jordan, Pontificia Univ. Católica de Chile (Chile)
Jihun Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kang-Miin Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Claudia Mendes Mendes de Oliveira, Univ. de São Paulo (Brazil)
Mercedes Lopez-Morales, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth McCracken, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stuart McMuldroch, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Joseph Miller, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Mueller, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jae Sok Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Cem Onyuksel, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Mark Ordway, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Byeong-Gon Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sung-Joon Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Charles Paxson, Harvard-Smithsonian Ctr. for Astrophysics (United States)
David Phillips, Harvard-Smithsonian Ctr. for Astrophysics (United States)
David Plummer, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Andreas Seifahrt, Univ. of Chicago (United States)
Daniel Stark, Steward Observatory, Univ. of Arizona (United States)
Joao Steiner, Univ. de São Paulo (Brazil)
Alan Uomoto, The Observatories of the Carnegie Institution for Science (United States)
Ronald Walsworth, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Young-Sam Yu, Korea Astronomy and Space Science Institute (Korea, Republic of)


Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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