James G. Ingalls

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The Infrared Spectrograph (IRS) is one of three science instruments on the Spitzer Space Telescope. The IRS comprises four separate spectrograph modules covering the wavelength range from 5.3 to 38 m with spectral resolutions, R 1⁄4 k= k 90 and 600, and it was optimized to take full advantage of the very low background in the space environment. The IRS is(More)
Spitzer Space Telescope imaging spectrometer observations of comet 9P/Tempel 1 during the Deep Impact encounter returned detailed, highly structured, 5- to 35-micrometer spectra of the ejecta. Emission signatures due to amorphous and crystalline silicates, amorphous carbon, carbonates, phyllosilicates, polycyclic aromatic hydrocarbons, water gas and ice,(More)
Antarctic Submillimeter Telescope and Remote Observatory ~AST/RO!, a 1.7 m diameter telescope for astronomy and aeronomy studies at wavelengths between 200 and 3000 mm, was installed at the South Pole during the 1994–95 Austral summer. The optical design is Gregorian, offset in both azimuth and elevation, with the exit pupil at the chopping tertiary mirror:(More)
The Infrared Array Camera (IRAC) on the Spitzer Space Telescope has been used to measure < 10−4 temporal variations in point sources (such as transiting extrasolar planets) at 3.6 and 4.5μm. Due to the under-sampled nature of the PSF, the warm IRAC arrays show variations of as much as 8% in sensitivity as the center of the PSF moves across a pixel due to(More)
One aim of modern astronomy is to detect temperate, Earth-like exoplanets that are well suited for atmospheric characterization. Recently, three Earth-sized planets were detected that transit (that is, pass in front of) a star with a mass just eight per cent that of the Sun, located 12 parsecs away. The transiting configuration of these planets, combined(More)
Spitzer observations of exoplanets routinely yield accuracies of better than one part in 10,000. However, there remain a number of issues that limit the attainable precision, particularly for long duration observations. These include initial pointing inaccuracies, pointing wobble, initial target drift, long-term pointing drifts, and low and high frequency(More)
AST/RO, a 1.7 m diameter telescope for astronomy and aeronomy studies at wavelengths between 200 and 2000 μm, was installed at South Pole during the 1994-95 Austral summer. The telescope operates continuously through the Austral winter, and is being used primarily for spectroscopic studies of neutral atomic carbon and carbon monoxide in the interstellar(More)
We investigate the density structure of the interstellar medium using new high-resolution maps of the 8μm, 24μm, and 70μm surface brightness towards a molecular cloud in the Gum Nebula, made as part of the Spitzer Space Telescope Galactic First Look Survey. The maps are correlated with 100μm images measured with IRAS. At 24 and 70μm, the spatial power(More)
The Infrared Spectrograph (IRS) is one of three science instruments on the Spitzer Space Telescope. The IRS comprises four separate spectrograph modules covering the wavelength range from 5.3 to 38μm with spectral resolutions, R = λ/∆λ ∼ 90 and 600, and it was optimized to take full advantage of the very low background in the space environment. The IRS is(More)