197 citations · 1.1k across the 16 of their papers we have counts for
16 papers
Carbon-rich presolar grains from massive stars. Subsolar 12C/13C and 14N/15N ratios and the mystery of 15N
M. Pignatari, E. Zinner, P. Hoppe +7
Carbon-rich grains with isotopic anomalies compared to the Sun are found in primitive meteorites. They were made by stars, and carry the original stellar nucleosynthesis signature.…
NanoSIMS, TEM, and XANES studies of a Unique Presolar Supernova Graphite Grain
Evan Groopman, Larry R. Nittler, Thomas Bernatowicz +1
We report on isotopic and microstructural investigations of a unique presolar supernova (SN) graphite grain, referred to as G6, isolated from the Orgueil CI chondrite. G6 contains…
C, N, and O Isotopic Heterogeneities in Low-density Supernova Graphite Grains from Orgueil
Evan Groopman, Thomas Bernatowicz, Ernst Zinner
We report on the results of NanoSIMS isotope imaging of low-density supernova graphite grains from the Orgueil meteorite. 70 nm thick microtomed sections of three supernova graphit…
Relics of ancient post-AGB stars in a primitive meteorite
Manavi Jadhav, Marco Pignatari, Falk Herwig +3
Graphite is one of the many presolar circumstellar condensate species found in primitive meteorites. While the isotopic compositions of low-density graphite grains indicate an orig…
Evidence for Radiogenic Sulfur-32 in Type AB Presolar Silicon Carbide Grains?
Wataru Fujiya, Peter Hoppe, Ernst Zinner +2
We report C, Si, and S isotope measurements on 34 presolar silicon carbide grains of Type AB, characterized by 12C/13C < 10. Nitrogen, Mg-Al-, and Ca-Ti-isotopic compositions were…
Silicon carbide grains of type C provide evidence for the production of the unstable isotope Si in supernovae
M. Pignatari, E. Zinner, M. G. Bertolli +8
Carbon-rich grains are observed to condense in the ejecta of recent core-collapse supernovae, within a year after the explosion. Silicon carbide grains of type X are C-rich grains…