Hydrogenated Fullerenes (Fulleranes) in Space
  Since the first laboratory synthesis of C$_{60}$ in 1985, fullerene-related
species have been proposed to interpret various astronomical features. After
more than 25 years' efforts, several circumstellar and interstellar features
have been convincingly assigned to C$_{60}$, C$_{70}$, and C$_{60}^+$. These
successes resulted from the recent advancements in observational, experimental,
as well as computational techniques, and re-stimulated interest in searching
for fullerene derivatives in space. As one of the most important fullerene
derivatives, hydrogenated fullerene (fullerane) is likely to exist in
circumstellar and interstellar conditions. This review gives an overview of the
chemical properties and spectral signals of fulleranes focusing on those
relevant to astronomy. We summarize previous proposals of fulleranes as the
carrier of astronomical features at UV, optical, infrared, and radio
wavelengths, and discuss the arguments favoring or disfavoring the presence of
fulleranes in astronomical environments. Although no unambiguous detection of
fulleranes in space has yet been reported, there are plausible evidences for
supporting the formation of certain fullerane isomers.
