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Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium
CALTECH, CA 91125 USA.
NASA, MD 20771 USA.
CALTECH, CA 91125 USA.
CALTECH, CA 91125 USA.
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2023 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 382, no 6677, p. 1411-1415Article in journal (Refereed) Published
Abstract [en]

Polycyclic aromatic hydrocarbons (PAHs) contain less than or similar to 20% of the carbon in the interstellar medium. They are potentially produced in circumstellar environments (at temperatures greater than or similar to 1000 kelvin), by (similar to 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-C-13 substituted compositions (Delta 2x(13)C values) of the PAHs naphthalene, fluoranthene, and pyrene are 9 to 51 parts per thousand higher than values expected for a stochastic distribution of isotopes. The Delta 2x(13)C 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 Delta 2x(13)C values consistent with formation by higher-temperature reactions.
Place, publisher, year, edition, pages
AMER ASSOC ADVANCEMENT SCIENCE , 2023. Vol. 382, no 6677, p. 1411-1415
National Category
Geology
Identifiers
URN: urn:nbn:se:liu:diva-201020DOI: 10.1126/science.adg6304ISI: 001128567800004PubMedID: 38127762OAI: oai:DiVA.org:liu-201020DiVA, id: diva2:1840194
Note

Funding Agencies|NSF Graduate Research Fellowship; NASA Emerging Worlds Grant [18-EW18_2-0084]; Simons Foundation; US Department of Energy BES Grant [DE-SC0016561]; NASA Consortium for Hayabusa2 Analysis of Organic Solubles; Japan Society for the Promotion of Science [21KK0062, 20H00202, JP20H00202, JP20H05846]; Australian Research Council through a Discovery Outstanding Research Award [DP130100577]; ARC Laureate fellowship [FL210100103]

Available from: 2024-02-22 Created: 2024-02-22 Last updated: 2024-02-22

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  • apa
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