Share Email Print
cover

Proceedings Paper

The first high resolution silicon immersion grating spectrograph
Author(s): Jian Ge; Daniel McDavitt; Bo Zhao; Suvrath Mahadevan; Curtis DeWitt; Sara Seager
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We report the development of the first high resolution cross-dispersed silicon immersion grating spectrometer. This instrument is called the Florida IR Silicon immersion grating specTrometer (FIRST). FIRST can produce R = 50,000 under a 0.6 arcsec seeing and simultaneously cover 1.3-1.8 μm with a 1kx1k HgCdTe array at the Apache Point Observatory 3.5 meter telescope. FIRST has a 50 mm diameter collimated beam and the overall instrument is within a volume of 0.8x0.5x0.5 m3. The high dispersion, large wavelength coverage and small instrument volume become possible due to the use of a silicon immersion grating (54.7 deg blaze angle and 50 mm diameter entrance pupil) with extremely high dispersion power (3.4 times dispersion power of a conventional echelle) and coarse grooves (16.1 l/mm, coarser than the commercially available echelles). The silicon immersion grating used in a lab bench mounted Czeney-Turner spectrograph with an only 25 mm diameter collimated beam and a 100 um core fiber has produced R = 55,000 cross-dispersed solar spectra. This instrument is designed to precisely measure radial velocities of low mass stars, M dwarfs for detecting 5-10 Earth mass planets. The estimated Doppler precision is ~ 3 m/s for a J = 9 M5V dwarf in 15 min at the APO 3.5m telescope.

Paper Details

Date Published: 28 June 2006
PDF: 12 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62691D (28 June 2006); doi: 10.1117/12.670860
Show Author Affiliations
Jian Ge, Univ. of Florida, Bryant Space Science Ctr. (United States)
Daniel McDavitt, Univ. of Florida, Bryant Space Science Ctr. (United States)
Bo Zhao, Univ. of Florida, Bryant Space Science Ctr. (United States)
Suvrath Mahadevan, Univ. of Florida, Bryant Space Science Ctr. (United States)
Curtis DeWitt, Univ. of Florida, Bryant Space Science Ctr. (United States)
Sara Seager, Carnegie Institution of Washington (United States)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

© SPIE. Terms of Use
Back to Top