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Are fulleranes responsible for the 21 micron feature?
YongZhang
School of Physics and Astronomy, Sun Yat-sen University, 2 Daxue Road, Tangjia, Zhuhai, Guangdong Province, China
Abstract:
Recent detections of C60, C70, and C+ 60 in space induced extensive studies of fullerene derivatives in circumstellar environments. As the promising fullerene sources, protoplanetary nebulae (PPNe) show a number of unidenti ed bands in their infrared spectra, among which a small sample exhibits an enigmatic feature at  21 m. Hydrogenation converts fullerenes into fulleranes, which breaks the symmetry of fullerene molecules and produce new infrared bands. In this paper, we investigate the possibility of fulleranes (C60Hm) as the carrier of the 21 m feature in terms of theoretical vibrational spectra of fulleranes. The evidences favoring and disfavoring the fullerane hypothesis are presented. We made an initial guess for the hydrogen coverage of C60Hm that may contribute to the 21 m feature.
Key words:  infrared, AGB and post-AGB, circumstellar matter, stars
FundProject:
Are fulleranes responsible for the 21 micron feature?
YongZhang
School of Physics and Astronomy, Sun Yat-sen University, 2 Daxue Road, Tangjia, Zhuhai, Guangdong Province, China
摘要:
Recent detections of C60, C70, and C+ 60 in space induced extensive studies of fullerene derivatives in circumstellar environments. As the promising fullerene sources, protoplanetary nebulae (PPNe) show a number of unidenti ed bands in their infrared spectra, among which a small sample exhibits an enigmatic feature at  21 m. Hydrogenation converts fullerenes into fulleranes, which breaks the symmetry of fullerene molecules and produce new infrared bands. In this paper, we investigate the possibility of fulleranes (C60Hm) as the carrier of the 21 m feature in terms of theoretical vibrational spectra of fulleranes. The evidences favoring and disfavoring the fullerane hypothesis are presented. We made an initial guess for the hydrogen coverage of C60Hm that may contribute to the 21 m feature.
关键词:  infrared, AGB and post-AGB, circumstellar matter, stars
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