A. Evans, J. Th. van Loon, C. E. Woodward, R. D. Gehrz, L. A. Helton, G. C. Clayton, M. T. Rushton, S. P. S. Eyres, J. Krautter, S. Starrfield, R. M. Wagner
We present infrared spectra of the binary XX Oph obtained with the Infrared
Spectrograph on the Spitzer Space Telescope. The data show some evidence for
the presence of solid C_60 - the first detection of C_60 in the solid phase -
together with the well-known "Unidentified Infrared" emission features. We
suggest that, in the case of XX Oph, the C_60 is located close to the hot
component, and that in general it is preferentially excited by stars having
effective temperatures in the range 15,000 - 30,000K. C_60 may be common in
circumstellar environments, but un-noticed in the absence of a suitable
exciting source.
View original:
http://arxiv.org/abs/1112.0518
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