Ion Irradiation of Frozen Methanol, Methane, and Benzene: Linking to the Colors of Centaurs and Trans-Neptunian Objects

Details Ion Irradiation of Frozen Methanol, Methane, and Benzene: Linking to the Colors of Centaurs and Trans-Neptunian Objects Ion Irradiation of Frozen Methanol, Methane, and Benzene: Linking to the Colors of Centaurs and Trans-Neptunian Objects

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...644..646b&link_type=abstract

The Astrophysical Journal, Volume 644, Issue 1, pp. 646-650.

Astronomy and Astrophysics

Astronomy

38

Astrochemistry, Ism: Cosmic Rays, Kuiper Belt, Methods: Laboratory, Techniques: Spectroscopic

Scientific paper

We present visible and near-infrared (0.65-2.7 μm) diffuse reflectance spectra of frozen (16-80 K) methanol (CH3OH), methane (CH4), and benzene (C6H6), collected before and after irradiation with 200 keV H+ and Ar+ ions, and 400 keV Ar++ ions, up to a dose released to target molecule of about 350 eV per 16 amu. The results evidence a strong reddening and darkening of the spectra, due to the formation of an organic (C-rich) refractory residue. The spectral behavior is compared with some Centaurs and trans-Neptunian objects; we find that many icy objects in the outer solar system may have grown an irradiation mantle, produced by cosmic ion irradiation of simple hydrocarbons and/or alcohols.

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