Detection of C60 and C70 in a Young Planetary Nebula

  title={Detection of C60 and C70 in a Young Planetary Nebula},
  author={J. Cami and J. Bernard-Salas and E. Peeters and S. Malek},
  pages={1180 - 1182}
Cosmic Fullerenes Since the discovery of the buckminsterfullerene C60 in laboratory experiments, it has been speculated that fullerenes could form abundantly in carbon-rich evolved stars and, because of their stability, survive the harsh radiation field in the interstellar medium as a gas-phase species. Cami et al. (p. 1180; published online 22 July; see the Perspective by Ehrenfreund and Foing) have detected large amounts of fullerenes in a peculiar planetary nebula with an extremely hydrogen… Expand

Topics from this paper

Fullerenes and Cosmic Carbon
Hydrogen-poor conditions in a planetary nebula enable the detection of carbon-cage molecules C60 and C70, confirming the existence of fullerenes in space, and raising important questions about the formation and evolution of fulLErene compounds in circumstellar regions. Expand
Are C60 molecules detectable in circumstellar shells of R Coronae Borealis stars
The hydrogen-poor, helium-rich and carbon-rich character of the gas around R Coronae Borealis (RCB) stars has been suggested to be a site for formation of C60 molecules. This suggestion is notExpand
Molecular Gas in the Circumstellar Environment of Unusual Evolved Stars
As lowand intermediate mass stars (M⋆ < 8−9 M⊙) age, they experience a series of evolutionary changes which culminate in the removal of nearly their entire envelope through extensive mass loss. TheExpand
Top-down formation of fullerenes in the interstellar medium.
This model predicts absolute abundances of C60 are up to several 10-4 of the elemental carbon, which is consistent with observational studies, and according to this model, once formed, C60 can survive much longer than other fullerenes in highly irradiated environments. Expand
Formation of Fullerenes in H-containing Planetary Nebulae
Hydrogen depleted environments are considered an essential requirement for the formation of fullerenes. The recent detection of C60 and C70 fullerenes in what was interpreted as the hydrogen-poorExpand
Gas and Dust in Galactic Planetary Nebulae at Sub-Solar Metallicity
Planetary nebulae are the final phases of evolution for low- to intermediate-mass stars (∼ 0.8– 8 M⊙). They consist of a central star surrounded predominantly by a circumstellar envelope containingExpand
Fullerenes in Circumstellar and Interstellar Environments
Abstract We recently identified several emission bands in the Spitzer-IRS spectrum of the unusual planetary nebula Tc 1 with the infrared active vibrational modes of the neutral fullerene species C60Expand
Interstellar and Circumstellar Fullerenes
  • J. Cami
  • Materials Science
  • Proceedings of the International Astronomical Union
  • 2018
In recent years, it has become clear that fullerenes (and in particular C60) are widespread and abundant in space, following their detection in a variety of astrophysical environments (see e.g. CamiExpand
Fullerenes and fulleranes in circumstellar envelopes
Three decades of search have recently led to convincing discoveries of cosmic fullerenes. The presence of C60 and C+ 60 in both circumstellar and interstellar environments suggests that theseExpand
A search for hydrogenated fullerenes in fullerene-containing planetary nebulae
Detections of C60 and C70 fullerenes 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 fullerenesExpand


Infrared Space Observatory's Discovery of C4H2, C6H2, and Benzene in CRL 618
We report on the detection with the Infrared Space Observatory (ISO), for the first time in the circumstellar medium, of the polyacetylenic chains C4H2 and C6H2 and of benzene (C6H6) in the directionExpand
Unusual Dust Emission from Planetary Nebulae in the Magellanic Clouds
We present a Spitzer Space Telescope spectroscopic study of a sample of 25 planetary nebulae (PNe) in the Magellanic Clouds (MCs). The low-resolution modules are used to analyze the dust featuresExpand
A search for C60 in carbonaceous chondrites.
Analysis of interior samples of the Murchison meteorite by two routes yielded an upper limit of 2 ppb for its C60 content, as compared to parts per million levels for individual polycyclic aromatic hydrocarbons (PAHs), arguing against the ubiquitous presence of C60 in the interstellar medium. Expand
Circumstellar envelopes and Asymptotic Giant Branch stars
Summary. Red giants are sometimes surrounded by envelopes, the result of the ejection of stellar matter at a large rate ( $\dot M> 10^{-7}M_\odot$/yr) and at a low velocity (10 km/s). In this reviewExpand
Silicon Carbide Absorption Features: Dust Formation in the Outflows of Extreme Carbon Stars
Infrared carbon stars without visible counterparts are generally known as extreme carbon stars. We have selected a subset of these stars with absorption features in the 10-13 μm range, which has beenExpand
The Search for Interstellar C60
The optical region of a number of reddened O-type stars has been examined on Keck I HIRES spectrograms (R = 45,000) for evidence of interstellar C60. No absorption features were detected near theExpand
Formation of polycyclic aromatic hydrocarbons in circumstellar envelopes
Production of polycyclic aromatic hydrocarbons in carbon-rich circumstellar envelopes was investigated using a kinetic approach. A detailed chemical reaction mechanism of gas-phase PAH formation andExpand
He, C, N, and O abundances in an ensemble of galactic planetary nebulae
The He, C, N, and O abundances in more than 120 planetary nebulae (PNe) of our Galaxy and the Magellanic Clouds have been redetermined by analyzing new PNe observations. The characteristics of PNeExpand
Detection of two interstellar absorption bands coincident with spectral features of C60+
MORE than a hundred well-defined absorption bands, arising from diffuse gas in the interstellar medium, have been observed in the visible and near-infrared spectra of stars 1–4. The identity of theExpand
Molecular survey of CRL618
We present the complete data set, model and line identification of a survey of the emission from the C-rich protoplanetary nebula CRL 618 performed with the IRAM-30m telescope in the followingExpand