{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Heck PR"],"funding":["U.S. Department of Energy","Tawani Foundation","Swiss National Science Foundation","National Aeronautics and Space Administration","Field Museum","DOE | LDRD | Lawrence Livermore National Laboratory","MCTI | Conselho Nacional de Desenvolvimento Científico e Tecnológico","National Science Foundation"],"pagination":["1884-1889"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC6995017"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["117(4)"],"pubmed_abstract":["We determined interstellar cosmic ray exposure ages of 40 large presolar silicon carbide grains extracted from the Murchison CM2 meteorite. Our ages, based on cosmogenic Ne-21, range from 3.9 ± 1.6 Ma to ∼3 ± 2 Ga before the start of the Solar System ∼4.6 Ga ago. A majority of the grains have interstellar lifetimes of <300 Ma, which is shorter than theoretical estimates for large grains. These grains condensed in outflows of asymptotic giant branch stars <4.9 Ga ago that possibly formed during an episode of enhanced star formation ∼7 Ga ago. A minority of the grains have ages >1 Ga. Longer lifetimes are expected for large grains. We determined that at least 12 of the analyzed grains were parts of aggregates in the interstellar medium: The large difference in nuclear recoil loss of cosmic r"],"journal":["Proceedings of the National Academy of Sciences of the United States of America"],"pubmed_title":["Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide."],"pmcid":["PMC6995017"],"funding_grant_id":["DE-AC52-07NA27344","NNX11AG77G","80NSSC17K0251","Major grant to Field Museum","200081/2005-5","NCCR PlanetS","19-FS-028","DGE-1144082","DGE-1746045","NNX15AC53G","NNX15AF78G","Visiting Scholarship","80NSSC19K0504"],"pubmed_authors":["Greer J","Trappitsch R","Heck PR","Wieler R","Koop L","Maden C","Gyngard F","Busemann H","Avila JN","Davis AM"],"additional_accession":[]},"is_claimable":false,"name":"Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide.","description":"We determined interstellar cosmic ray exposure ages of 40 large presolar silicon carbide grains extracted from the Murchison CM2 meteorite. Our ages, based on cosmogenic Ne-21, range from 3.9 ± 1.6 Ma to ∼3 ± 2 Ga before the start of the Solar System ∼4.6 Ga ago. A majority of the grains have interstellar lifetimes of <300 Ma, which is shorter than theoretical estimates for large grains. These grains condensed in outflows of asymptotic giant branch stars <4.9 Ga ago that possibly formed during an episode of enhanced star formation ∼7 Ga ago. A minority of the grains have ages >1 Ga. Longer lifetimes are expected for large grains. We determined that at least 12 of the analyzed grains were parts of aggregates in the interstellar medium: The large difference in nuclear recoil loss of cosmic r","dates":{"release":"2020-01-01T00:00:00Z","publication":"2020 Jan","modification":"2025-04-19T10:54:57.562Z","creation":"2020-05-22T09:33:16Z"},"accession":"S-EPMC6995017","cross_references":{"pubmed":["31932423"],"doi":["10.1073/pnas.1904573117"]}}