The Synthesis of Benzene in the Proto-planetary Nebula CRL 618

Details The Synthesis of Benzene in the Proto-planetary Nebula CRL 618 The Synthesis of Benzene in the Proto-planetary Nebula CRL 618

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...574l.167w&link_type=abstract

The Astrophysical Journal, Volume 574, Issue 2, pp. L167-L170.

Astronomy and Astrophysics

Astronomy

40

Astrochemistry, Stars: Agb And Post-Agb, Stars: Individual: Alphanumeric: Crl 618

Scientific paper

We show that the physical conditions in CRL 618 are such that efficient formation of benzene, C6H6, occurs. A combination of high temperatures, high densities, and high ionization rates drives an efficient ion-molecule chemistry involving condensation reactions of acetylene and its derivatives, rather than reactions involving atomic hydrogen, as was suggested for the interstellar synthesis of benzene. We find a column density of benzene within a factor of 2 of that observed providing that the material is trapped in a long-lived reservoir of gas in the disk around CRL 618. We note that the chemistry can give rise to other carbon chain molecules as well as a large abundance of benzonitrile, C6H5CN.

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