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Physical Chemistry

Fullerenes Found In Space

Astrochemistry: Astronomers detect C60 and C70 in dying star

by Elizabeth K. Wilson
July 26, 2010 | A version of this story appeared in Volume 88, Issue 30

Astronomers have detected fullerenes in a planetary nebula, shown in this artist’s rendering.
Credit: T. Pyle/JPL Caltech/NASA

Large amounts of the fullerenes C60 and C70 have been detected in a blast of gas from a dying star—the first unambiguous finding of this form of carbon in space.

The discovery suggests that fullerenes form readily in space, given the right conditions.

Fullerenes, stable and inert, have long been believed to be able to exist in space, particularly near the environment of carbon-rich stars, but evidence has been limited to inconclusive spectra and traces of the molecules in meteorites that fell to Earth.

Astronomer Jan Cami of the University of Western Ontario and his colleagues trained NASA’s Spitzer Space Telescope on a carbon-rich planetary nebula—a star in the late stages of life—and found all of the characteristic infrared emission spectral lines of cold, neutral C60 and C70 (Science, DOI: 10.1126/science.1192035).

Pascale Ehrenfreund, professor of astrobiology at the University of Amsterdam, notes that the detection is “rather unambiguous,” and that these new data are “the best I have seen so far.”

The giant envelopes of gas thrown off by planetary nebulas are rich sources of big molecules, formed by chemical reactions among elements. Many of them are heavy elements such as carbon, which the star has synthesized during its life. These species then go on to populate the interstellar medium.

“The detection of fullerenes and the identification of their formation site are considered one of the priorities in the field of interstellar organic chemistry,” the authors write in their paper.

Previous hunts for fullerenes in planetary nebulas have been difficult because emissions from these stars are often dominated by the strong, complex emissions of another carbon-rich class of molecules, polycyclic aromatic hydrocarbons (PAHs). But in the planetary nebula studied by the authors, there were no signs of PAHs, indicating that the dying star’s environment is unusually hydrogen-poor—an ideal condition for forming fullerenes.

David E. Woon, an astrochemist at the University of Illinois, Urbana-Champaign, points out that the new, recently operational, aircraft-based infrared telescope SOFIA, from NASA and the German Aerospace Center, will be able to add to the study of C60, C70, and other IR-active molecules.



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