Fullerenes in circumstellar and interstellar environments

Details Fullerenes in circumstellar and interstellar environments Fullerenes in circumstellar and interstellar environments

2011-11-09

arxiv.org/abs/1111.2254v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

12 pages, 5 figures. To appear in the proceedings of IAU symposium 280 "The Molecular Universe"

Scientific paper

We recently identified several emission bands in the Spitzer-IRS spectrum of the unusual planetary nebula Tc 1 with the infrared active vibrational modes of the neutral fullerene species C60 and C70. Since then, the fullerene bands have been detected in a variety of sources representing circumstellar and interstellar environments. Abundance estimates suggest that C60 represents ~0.1%-1.5% of the available carbon in those sources. The observed relative band intensities in various sources are not fully compatible with single-photon heating and fluorescent cooling, and are better reproduced by a thermal distribution at least in some sources. The observational data suggests that fullerenes form in the circumstellar environments of evolved stars, and survive in the interstellar medium. Precisely how they form is still a matter of debate.

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