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GMTNIRS (Giant Magellan Telescope Near-IR Spectrograph)

GMTNIRS (Giant Magellan Telescope Near-IR Spectrograph). Survey Science Group Workshop 3 조 김상혁 김재영 최나현 2013.02.15. Index. Concept of GMTNIRS Specification of GMTNIRS Silicon immersion grating Software Summary. Concepts of GMTNIRS.

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GMTNIRS (Giant Magellan Telescope Near-IR Spectrograph)

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  1. GMTNIRS(Giant Magellan Telescope Near-IR Spectrograph) Survey Science Group Workshop 3조 김상혁김재영 최나현 2013.02.15

  2. Index • Concept of GMTNIRS • Specification of GMTNIRS • Silicon immersion grating • Software • Summary

  3. Concepts of GMTNIRS • GMTNIRS will perform unique and substantial studies of many aspects of stars and planets using their high resolution Near-IR spectroscopy. • Science areas • The physical picture of YSOs(Young Stellar Objects) • Fundamental stellar properties • Radial velocity • Magnetic field strength • The chemistry and structure of protoplanetary disks • Planet formation • Discoveries of Jupiter and Saturn-mass objects orbiting brown dwarfs • Disk instabilities • Core accretions • Chemical evolution of the AGB and RGB stars • The structure of their photospheres • The mass loss rates

  4. Specification of GMTNIRS • Instrument concept • The short wavelength (JHK) module • The long wavelength (LM) module • Adaptive optics system

  5. J Off-axis parabolic collimator Entrance Slit Silicon Immersion Echelle Grating H K Volume Phase Holographic Gratings Off-axis elliptical collimator Fig. 1. Optical Layout of JHK module

  6. Entrance Slit Silicon Immersion Echelle Grating Off-axis parabolic collimator Silicon Immersion Echelle Grating Reflection Grating M L Off-axis elliptical collimator Fig. 2. Optical Layout of LM module

  7. Silicon Immersion Gratings • Prism-shaped reflection grating • The high refractive index (n=3.4) of silicon • Keep the high spectral resolution with a much smaller beam size. • Silicon lithography • enables continuous spectral coverage. • coarse gratings can be fabricated by silicon lithographic methods. Fig.3. Schematic figure of an immersion grating.

  8. Software Fig.4. Electronics and software layout

  9. Summary • GMTNIRS will be a key to solve various astrophysical questions and provide a revolution of a spectrograph, particularly in wavelength coverage. • GMTNIRS will use relatively well developed technologies, but the outcome will give a significant achievement in the IR spectroscopy. • GMTNIRS will improve the grating quality to be compact and robust by using silicon immersion gratings.

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