The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)

• Main Authors: Szentgyorgyi, Andrew, Baldwin, Daniel, Barnes, Stuart, Bean, Jacob, Ben-Ami, Sagi, Brennan, Patricia, Budynkiewicz, Jamie, Chun, Moo-Young, Conroy, Charlie, Crane, Jeffrey D., Epps, Harland, Evans, Ian, Evans, Janet, Foster, Jeff, Frebel, Anna, Gauron, Thomas, Guzmán, Dani, Hare, Tyson, Jang, Bi-Ho, Jang, Jeong-Gyun, Jordan, Andres, Kim, Jihun, Kim, Kang-Miin, Mendes de Oliveira, Claudia Mendes, Lopez-Morales, Mercedes, McCracken, Kenneth, McMuldroch, Stuart, Miller, Joseph, Mueller, Mark, Oh, Jae Sok, Onyuksel, Cem, Ordway, Mark, Park, Byeong-Gon, Park, Chan, Park, Sung-Joon, Paxson, Charles, Phillips, David, Plummer, David, Podgorski, William, Seifahrt, Andreas, Stark, Daniel, Steiner, Joao, Uomoto, Alan, Walsworth, Ronald, Yu, Young-Sam
• Other Authors: Univ Arizona, Steward Observ
• Language: en
• Published: SPIE-INT SOC OPTICAL ENGINEERING 2016
• Subjects: Echelle spectrograph; precision radial velocity; G-CLEF; GMT; high dispersion spectroscopy; ELTs
• Online Access: 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 and Young-Sam Yu " The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT) ", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990822 (August 9, 2016); doi:10.1117/12.2233506; http://dx.doi.org/10.1117/12.2233506; http://hdl.handle.net/10150/622810; http://arizona.openrepository.com/arizona/handle/10150/622810

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 vacuumenclosed 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 3500 angstrom to . 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.