6 July 2018 IGRINS at the Discovery Channel Telescope and Gemini South
Author Affiliations +
The Immersion GRating INfrared Spectrometer (IGRINS) was designed for high-throughput with the expectation of being a visitor instrument at progressively larger observing facilities. IGRINS achieves R∼45000 and > 20,000 resolution elements spanning the H and K bands (1.45-2.5μm) by employing a silicon immersion grating as the primary disperser and volume-phase holographic gratings as cross-dispersers. After commissioning on the 2.7 meter Harlan J. Smith Telescope at McDonald Observatory, the instrument had more than 350 scheduled nights in the first two years. With a fixed format echellogram and no cryogenic mechanisms, spectra produced by IGRINS at different facilities have nearly identical formats. The first host facility for IGRINS was Lowell Observatory’s 4.3-meter Discovery Channel Telescope (DCT). For the DCT a three-element fore-optic assembly was designed to be mounted in front of the cryostat window and convert the f/6.1 telescope beam to the f/8.8 beam required by the default IGRINS input optics. The larger collecting area and more reliable pointing and tracking of the DCT improved the faint limit of IGRINS, relative to the McDonald 2.7-meter, by ∼1 magnitude. The Gemini South 8.1-meter telescope was the second facility for IGRINS to visit. The focal ratio for Gemini is f/16, which required a swap of the four-element input optics assembly inside the IGRINS cryostat. At Gemini, observers have access to many southern-sky targets and an additional gain of ∼1.5 magnitudes compared to IGRINS at the DCT. Additional adjustments to IGRINS include instrument mounts for each facility, a glycol cooled electronics rack, and software modifications. Here we present instrument modifications, report on the success and challenges of being a visitor instrument, and highlight the science output of the instrument after four years and 699 nights on sky. The successful design and adaptation of IGRINS for various facilities make it a reliable forerunner for GMTNIRS, which we now anticipate commissioning on one of the 6.5 meter Magellan telescopes prior to the completion of the Giant Magellan Telescope.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gregory Mace, Gregory Mace, Kimberly Sokal, Kimberly Sokal, Jae-Joon Lee, Jae-Joon Lee, Heeyoung Oh, Heeyoung Oh, Chan Park, Chan Park, Hanshin Lee, Hanshin Lee, John Good, John Good, Phillip MacQueen, Phillip MacQueen, Jae Sok Oh, Jae Sok Oh, Kyle Kaplan , Kyle Kaplan , Ben Kidder, Ben Kidder, Moo-Young Chun, Moo-Young Chun, In-Soo Yuk , In-Soo Yuk , Ueejeong Jeong, Ueejeong Jeong, Soojong Pak, Soojong Pak, Kang-Min Kim, Kang-Min Kim, Jakyoung Nah, Jakyoung Nah, Sungho Lee, Sungho Lee, Young-Sam Yu, Young-Sam Yu, Narae Hwang, Narae Hwang, Byeong-Gon Park, Byeong-Gon Park, Hwihyun Kim, Hwihyun Kim, Brian Chinn, Brian Chinn, Alison Peck, Alison Peck, Ruben Diaz, Ruben Diaz, Rene Rutten, Rene Rutten, Lisa Prato, Lisa Prato, George Jacoby, George Jacoby, Frank Cornelius, Frank Cornelius, Ben Hardesty, Ben Hardesty, William DeGroff, William DeGroff, Edward Dunham, Edward Dunham, Stephen Levine, Stephen Levine, Larissa Nofi, Larissa Nofi, Ricardo Lopez-Valdivia, Ricardo Lopez-Valdivia, Alycia J. Weinberger, Alycia J. Weinberger, Daniel T. Jaffe, Daniel T. Jaffe, "IGRINS at the Discovery Channel Telescope and Gemini South", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107020Q (6 July 2018); doi: 10.1117/12.2312345; https://doi.org/10.1117/12.2312345


300 nights of science with IGRINS at McDonald Observatory
Proceedings of SPIE (August 02 2016)
Project management at a university
Proceedings of SPIE (June 26 2006)
SMARTS revealed
Proceedings of SPIE (July 29 2010)
New optical telescope projects at Devasthal Observatory
Proceedings of SPIE (September 16 2012)
Development plan of Korea for the GMT
Proceedings of SPIE (October 13 2010)

Back to Top