Near Infrared Spectroscopy of Jovian Trojan Asteroids: A Search for Silicate Features

Details Near Infrared Spectroscopy of Jovian Trojan Asteroids: A Search for Silicate Features Near Infrared Spectroscopy of Jovian Trojan Asteroids: A Search for Silicate Features

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3312y&link_type=abstract

American Astronomical Society, DPS meeting #39, #33.12; Bulletin of the American Astronomical Society, Vol. 39, p.478

Astronomy and Astrophysics

Astronomy

Scientific paper

Spectroscopic studies show that the reflectance spectra of Jovian Trojan asteroids generally appear to be linear and moderately red (with a few neutral ones) in the optical and near infrared wavelength regions. Cruikshank et al. (2001) demonstrated that synthetic models incorporating magnesium-rich pyroxene (Mg, Fe SiO3) and carbon could match the low albedo and the shape of the reflectance spectrum of Trojan Hektor from 0.3 to 3.6 micron. More importantly, Spitzer thermal emission spectra of three Trojan asteroids all showed an emissivity plateau near 10-micron, which was interpreted as an indication of fine-grained silicates (Emery et al. 2006). Interestingly, the previous survey (Howell 1995) noted that several Trojans showed a broad absorption band between 1.1 and 1.25 micron based on broadband infrared colors. This possible 1 micron feature is consistent with the 1 micron silicate band that has been observed and well studied on many main belt asteroids.
We obtained near infrared (NIR) spectroscopy (0.8-2.5 micron) on 7 Trojan asteroids having reported silicate-related absorption bands. Also, the unique asteroid (279) Thule in the 3:4 mean-motion resonance was observed. The observations were made with the NASA Infrared Telescope Facility (IRTF) atop Mauna Kea. We will present the new spectra and simple scattering models employed to constrain the surface properties of Trojan asteroids.

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