Fullerenes and fulleranes in circumstellar envelopes

[摘要] Three decades of search have recently led to convincing discoveries of cosmic fullerenes. The presence of C60and C+60in both circumstellar and interstellar environments suggests that these molecules and their derivatives can be efficiently formed in circumstellar envelopes and survive in harsh conditions. Detailed analysis of the infrared bands from fullerenes and their connections with the local properties can provide valuable information on the physical conditions and chemical processes that occurred in the late stages of stellar evolution. The identification of C+60as the carrier of four diffuse interstellar bands (DIBs) suggests that fullerene- related compounds are abundant in interstellar space and are essential for resolving the DIB mystery. Experiments have revealed a high hydrogenation rate when C60is exposed to atomic hydrogen, motivating the attempt to search for cosmic fulleranes. In this paper, we present a short review of current knowledge of cosmic fullerenes and fulleranes and briefly discuss the implications on circumstellar chemistry.

[发布机构] Laboratory for Space Research, Faculty of Science, University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong^1;Department of Physics, University of Hong Kong, Hong Kong, Hong Kong^2

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Circumstellar envelopes;Diffuse interstellar bands;Hydrogenation rate;Interstellar environment;Interstellar space;Physical conditions;Related compounds;Stellar evolutions