Observations of the near-infrared spectrum of the zodiacal light with ciber

K. Tsumura, J. Battle, J. Bock, A. Cooray, V. Hristov, B. Keating, D. H. Lee, L. R. Levenson, P. Mason, T. Matsumoto, S. Matsuura, U. W. Nam, T. Renbarger, I. Sullivan, K. Suzuki, T. Wada, M. Zemcov

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

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 0.75 and 2.1μm 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 0.9μm, 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 2.5μm using Infrared Telescope in Space (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 relatively high albedo of asteroidal dust compared with cometary dust.

Original languageEnglish
Pages (from-to)394-402
Number of pages9
JournalAstrophysical Journal
Volume719
Issue number1
DOIs
Publication statusPublished - 2010 Aug 10

Keywords

  • Infrared: Diffuse background
  • Interplanetary medium
  • Zodiacal dust

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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