Observations of the Near-Infrared Spectrum of the Zodiacal Light with CIBER

Details Observations of the Near-Infrared Spectrum of the Zodiacal Light with CIBER Observations of the Near-Infrared Spectrum of the Zodiacal Light with CIBER

2010-04-30

arxiv.org/abs/1004.5445v2

Astrophysical Journal 719 (2010) 394-402

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

9 pages, 11 figures

Scientific paper

Interplanetary dust (IPD) scatters solar radiation which results in the zodiacal light that dominates the celestial diffuse brightness at optical and near-infrared wavelengths. Both asteroid collisions and cometary ejections produce the IPD, but the relative contribution from these two sources is still unknown. The Low Resolution Spectrometer (LRS) onboard the Cosmic Infrared Background Experiment (CIBER) observed the astrophysical sky spectrum between 750 and 2100 nm over a wide range of ecliptic latitude. The resulting zodiacal light spectrum is redder than the solar spectrum, and shows a broad absorption feature, previously unreported, at approximately 900 nm, suggesting the existence of silicates in the IPD material. The spectral shape of the zodiacal light is isotropic at all ecliptic latitudes within the measurement error. The zodiacal light spectrum, including the extended wavelength range to 2500 nm using IRTS data, is qualitatively similar to the reflectance of S-type asteroids. This result can be explained by the proximity of S-type asteroidal dust to Earth's orbit, and the relativily high albedo of asteridal dust compared with cometary dust.

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