Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium.
Science
; 382(6677): 1411-1416, 2023 12 22.
Article
en En
| MEDLINE
| ID: mdl-38127762
ABSTRACT
Polycyclic aromatic hydrocarbons (PAHs) contain â²20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures â³1000 kelvin), by reactions within cold (~10 kelvin) interstellar clouds, or by processing of carbon-rich dust grains. We report isotopic properties of PAHs extracted from samples of the asteroid Ryugu and the meteorite Murchison. The doubly-13C substituted compositions (Δ2×13C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51 higher than values expected for a stochastic distribution of isotopes. The Δ2×13C values are higher than expected if the PAHs formed in a circumstellar environment, but consistent with formation in the interstellar medium. By contrast, the PAHs phenanthrene and anthracene in Ryugu samples have Δ2×13C values consistent with formation by higher-temperature reactions.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Año:
2023
Tipo del documento:
Article