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dc.contributor.authorHaenecour, P.
dc.contributor.authorFloss, C.
dc.contributor.authorJosé Pont, Jordi
dc.contributor.authorAmari, S.
dc.contributor.authorLodders, K.
dc.contributor.authorJadhav, M.
dc.contributor.authorWang, A.
dc.contributor.authorGyngard, F.
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.date.accessioned2017-02-03T09:58:18Z
dc.date.available2017-02-03T09:58:18Z
dc.date.issued2016-07
dc.identifier.citationHaenecour, P., Floss, C., Jose, J., Amari, S., Lodders, K., Jadhav, M., Wang, A., Gyngard, F. Coordinated analysis of two graphite grains from the CO3.0 LAP 031117 meteorite: First identification of a CO Nova graphite and a presolar iron sulfide subgrain. "Astrophysical journal", Juliol 2016, vol. 825, p. 8-1-8-9.
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/2117/100533
dc.description.abstractPresolar grains constitute remnants of stars that existed before the formation of the solar system. In addition to providing direct information on the materials from which the solar system formed, these grains provide ground-truth information for models of stellar evolution and nucleosynthesis. Here we report the in-situ identification of two unique presolar graphite grains from the primitive meteorite LaPaz Icefield 031117. Based on these two graphite grains, we estimate a bulk presolar graphite abundance of 5-3+7 ppm in this meteorite. One of the grains (LAP-141) is characterized by an enrichment in 12C and depletions in 33,34S, and contains a small iron sulfide subgrain, representing the first unambiguous identification of presolar iron sulfide. The other grain (LAP-149) is extremely 13C-rich and 15N-poor, with one of the lowest 12C/13C ratios observed among presolar grains. Comparison of its isotopic compositions with new stellar nucleosynthesis and dust condensation models indicates an origin in the ejecta of a low-mass CO nova. Grain LAP-149 is the first putative nova grain that quantitatively best matches nova model predictions, providing the first strong evidence for graphite condensation in nova ejecta. Our discovery confirms that CO nova graphite and presolar iron sulfide contributed to the original building blocks of the solar system.
dc.language.isoeng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física::Astronomia i astrofísica
dc.subject.lcshMeteorites
dc.subject.lcshCosmochemistry
dc.subject.lcshNucleosynthesis
dc.subject.lcshSupernovae
dc.subject.lcshStars
dc.subject.othermeteorites
dc.subject.othermeteors
dc.subject.othermeteoroids
dc.subject.otherstars: astrochemistry
dc.subject.othercircumstellar matter
dc.subject.othernovae
dc.subject.othercataclysmic variables
dc.subject.othersupernovae: general
dc.subject.othernuclear reactions
dc.subject.othernucleosynthesis
dc.subject.otherabundances
dc.subject.otherstars: winds
dc.subject.otheroutflows
dc.subject.otherstars: formation
dc.subject.otherstars: fundamental parameters
dc.subject.otherstars: evolution.
dc.titleCoordinated analysis of two graphite grains from the CO3.0 LAP 031117 meteorite: First identification of a CO Nova graphite and a presolar iron sulfide subgrain
dc.typeArticle
dc.subject.lemacEstels
dc.subject.lemacAstroquímica
dc.subject.lemacCosmoquímica
dc.contributor.groupUniversitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
dc.identifier.doi10.3847/0004-637X/825/2/88
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
local.identifier.drac19374045
dc.description.versionPostprint (author's final draft)
local.citation.authorHaenecour, P.; Floss, C.; Jose, J.; Amari, S.; Lodders, K.; Jadhav, M.; Wang, A.; Gyngard, F.
local.citation.publicationNameAstrophysical journal
local.citation.volume825
local.citation.startingPage8-1
local.citation.endingPage8-9


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