A search for hydrogenated fullerenes in fullerene-containing planetary nebulae

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Díaz-Luis, J.J.^1,2 ; García-Hernández, D.A.^1,2 ; Manchado, A.^1,2,3 ; Cataldo, F.^4,5

Instituto de Astrofísica de Canarias, C/ Via Láctea s/n, La Laguna

E-38205, Spain^1

Departamento de Astrofísica, Universidad de la Laguna (ULL), La Laguna

E-38206, Spain^2

Consejo Superior de Investigaciones Científicas, Madrid, Spain^3

INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, Catania

95123, Italy^4

Actinium Chemical Research Srl, Via Casilina 1626/A, Rome

00133, Italy^5

关键词: C70 fullerenes;    Hydrogenated fullerenes;    Infrared bands;    Magellanic Clouds;    Planetary nebulae;    Radiation field;    Spectral region;    Transition phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/5/052005/pdf
DOI  :  10.1088/1742-6596/728/5/052005

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Detections of C60and C70fullerenes in planetary nebulae (PNe) of the Magellanic Clouds and of our own Galaxy have raised the idea that other forms of carbon such as hydrogenated fullerenes (fulleranes like C60H36and C60H18), buckyonions, and carbon nanotubes, may be widespread in the Universe. Here we present VLT/ISAAC spectra (R ∼600) in the 2.9-4.1 μm spectral region for the Galactic PNe Tc 1 and M 1-20, which have been used to search for fullerene-based molecules in their fullerene-rich circumstellar environments. We report the non-detection of the most intense infrared bands of several fulleranes around ∼3.4-3.6 μm in both PNe. We conclude that if fulleranes are present in the fullerene-containing circumstellar environments of these PNe, then they seem to be by far less abundant than C60and C70. Our non-detections together with the (tentative) fulleranes detection in the proto-PN IRAS 01005+7910 suggest that fulleranes may be formed in the short transition phase between AGB stars and PNe but they are quickly destroyed by the UV radiation field from the central star.