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Proceedings Paper

300 nights of science with IGRINS at McDonald Observatory
Author(s): Gregory Mace; Hwihyun Kim; Daniel T. Jaffe; Chan Park; Jae-Joon Lee; Kyle Kaplan; Young Sam Yu; In-Soo Yuk; Moo-Young Chun; Soojong Pak; Kang-Min Kim; Jeong-Eun Lee; Christopher A. Sneden; Melike Afsar; Michael D. Pavel; Hanshin Lee; Heeyoung Oh; Ueejeong Jeong; Sunkyung Park; Benjamin Kidder; Hye-In Lee; Huynh Anh Nguyen Le; Jacob McLane; Michael Gully-Santiago; Jae Sok Oh; Sungho Lee; Narae Hwang; Byeong-Gon Park
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Paper Abstract

The Immersion Grating Infrared Spectrometer (IGRINS) is a revolutionary instrument that exploits broad spectral coverage at high-resolution in the near-infrared. IGRINS employs a silicon immersion grating as the primary disperser, and volume-phase holographic gratings cross-disperse the H and K bands onto Teledyne Hawaii-2RG arrays. The use of an immersion grating facilitates a compact cryostat while providing simultaneous wavelength coverage from 1.45 - 2.5 μm. There are no cryogenic mechanisms in IGRINS and its high-throughput design maximizes sensitivity. IGRINS on the 2.7 meter Harlan J. Smith Telescope at McDonald Observatory is nearly as sensitive as CRIRES at the 8 meter Very Large Telescope. However, IGRINS at R≈45,000 has more than 30 times the spectral grasp of CRIRES* in a single exposure. Here we summarize the performance of IGRINS from the first 300 nights of science since commissioning in summer 2014. IGRINS observers have targeted solar system objects like Pluto and Ceres, comets, nearby young stars, star forming regions like Taurus and Ophiuchus, the interstellar medium, photo dissociation regions, the Galactic Center, planetary nebulae, galaxy cores and super novae. The rich near-infrared spectra of these objects motivate unique science cases, and provide information on instrument performance. There are more than ten submitted IGRINS papers and dozens more in preparation. With IGRINS on a 2.7m telescope we realize signal-to-noise ratios greater than 100 for K=10.3 magnitude sources in one hour of exposure time. Although IGRINS is Cassegrain mounted, instrument flexure is sub-pixel thanks to the compact design. Detector characteristics and stability have been tested regularly, allowing us to adjust the instrument operation and improve science quality. A wide variety of science programs motivate new tools for analyzing high-resolution spectra including multiplexed spectral extraction, atmospheric model fitting, rotation and radial velocity, unique line identification, and circumstellar disk modeling. Here we discuss details of instrument performance, summarize early science results, and show the characteristics of IGRINS as a versatile near-infrared spectrograph and forerunner of future silicon immersion grating spectrographs like iSHELL2 and GMTNIRS.3

Paper Details

Date Published: 3 August 2016
PDF: 15 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99080C (3 August 2016); doi: 10.1117/12.2232780
Show Author Affiliations
Gregory Mace, The Univ. of Texas at Austin (United States)
Hwihyun Kim, The Univ. of Texas at Austin (United States)
Korea Astronomy and Space Science Institute (Korea, Republic of)
Daniel T. Jaffe, The Univ. of Texas at Austin (United States)
Chan Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jae-Joon Lee, Korea Astronomy and Space Science Institute (Korea, Republic of)
Kyle Kaplan, The Univ. of Texas at Austin (United States)
Young Sam Yu, Korea Astronomy and Space Science Institute (Korea, Republic of)
In-Soo Yuk, Korea Astronomy and Space Science Institute (Korea, Republic of)
Moo-Young Chun, Korea Astronomy and Space Science Institute (Korea, Republic of)
Soojong Pak, Kyung Hee Univ. (Korea, Republic of)
Kang-Min Kim, Korea Astronomy and Space Science Institute (Korea, Republic of)
Jeong-Eun Lee, Kyung Hee Univ. (Korea, Republic of)
Christopher A. Sneden, The Univ. of Texas at Austin (United States)
Melike Afsar, Ege Univ. (Turkey)
The Univ. of Texas at Austin (United States)
Michael D. Pavel, The Univ. of Texas at Austin (United States)
Hanshin Lee, The Univ. of Texas at Austin (United States)
Heeyoung Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Ueejeong Jeong, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sunkyung Park, Kyung Hee Univ. (Korea, Republic of)
Benjamin Kidder, The Univ. of Texas at Austin (United States)
Hye-In Lee, Kyung Hee Univ. (Korea, Republic of)
Huynh Anh Nguyen Le, Kyung Hee Univ. (Korea, Republic of)
Jacob McLane, The Univ. of Texas at Austin (United States)
Michael Gully-Santiago, Kavli Institute for Astronomy and Astrophysics (China)
Jae Sok Oh, Korea Astronomy and Space Science Institute (Korea, Republic of)
Sungho Lee, Korea Astronomy and Space Science Institute (Korea, Republic of)
Narae Hwang, Korea Astronomy and Space Science Institute (Korea, Republic of)
Byeong-Gon Park, Korea Astronomy and Space Science Institute (Korea, Republic of)
Univ. of Science and Technology (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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