355 citations · 1.4k across the 15 of their papers we have counts for
16 papers
OSIRIS-REx Returned a Pristine Sample of Asteroid Bennu: Takeaways from the Mission's Contamination Control and Knowledge Program
Jason P. Dworkin, Scott A. Sandford, Nicole G. Lunning +81
NASA's OSIRIS-REx mission had the objective of delivering a pristine sample from asteroid (101955) Bennu to Earth for scientific analysis--where "pristine" signifies the absence of…
New NanoSIMS Multielement Isotope Data Reveal CO Novae As Key Sources Of 13C-rich Presolar Silicon Carbide Grains
Jordi José, Nan Liu, Conel M. O'D. Alexander +1
We present new multielement NanoSIMS isotopic measurements (C, N, Si, Mg-Al, Ti, and Ni) for four putative nova SiC grains and 79 AB SiC grains from the Murchison meteorite to reas…
Explosive Nucleosynthesis in Core-Collapse Type II Supernovae: Insights from new C, N, Si, and Al-Mg isotopic compositions of presolar grains
Nan Liu, Conel M. O'D. Alexander, Bradley S. Meyer +3
We report C, N, Si, and Al-Mg isotope data for 39 presolar X silicon carbide (SiC) and four silicon nitride grains - a group of presolar grains that condensed in the remnants of co…
Equilibrium Condensation from Chondritic Porous IDP Enriched Vapor: Implications for Mercury and Enstatite Chondrite Origins
Denton S. Ebel, Conel M. O'D. Alexander
The origin of Mercury's anomalous core and low FeO surface mineralogy are outstanding questions in planetary science. Mercury's composition may result from cosmochemical controls o…
Vapor-Melt Exchange -- Constraints on Chondrite Formation Conditions and Processes
Denton S. Ebel, Conel M. O'D. Alexander, Guy Libourel
The bulk volatile contents of chondritic meteorites provide clues to their origins. Matrix and chondrules carry differing abundances of moderately volatile elements, with chondrule…
Presolar stardust in asteroid Ryugu
Jens Barosch, Larry R. Nittler, Jianhua Wang +121
We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection…
New Multielement Isotopic Compositions of Presolar SiC Grains: Implications for Their Stellar Origins
Nan Liu, Jens Barosch, Larry R. Nittler +5
We report NanoSIMS Si and Mg-Al isotopic data (and C, N, and Ti isotopic data when available) for 85 submicron- to micron-sized presolar SiC grains from the CM2 Murchison meteorite…
High Abundances of Presolar Grains and N-rich Organic Matter in CO3.0 Chondrite Dominion Range 08006
Larry R. Nittler, Conel M. O'D. Alexander, Jemma Davidson +3
NanoSIMS C-, N-, and O-isotopic mapping of matrix in CO3.0 chondrite Dominion Range (DOM) 08006 revealed it to have in its matrix the highest abundance of presolar O-rich grains (2…
Common Occurrence of Explosive Hydrogen Burning in Type II Supernovae
Nan Liu, Thomas Stephan, Patrick Boehnke +6
We report Mo isotopic data for 16 15N-rich presolar SiC grains of type AB (14N/15N<solar, AB1) and their correlated Sr and Ba isotope ratios when available. Eight of the 16 AB1 gra…
The Effect of Jupiter's Formation on the Distribution of Refractory Elements and Inclusions in Meteorites
Steven J. Desch, Anusha Kalyaan, Conel M. O'D. Alexander
We present a comprehensive evolutionary model of the Sun's protoplanetary disk, constructed to resolve the "CAI Storage" problem of meteoritics. We predict the abundances of calciu…
Exploring the Origins of Deuterium Enrichments in Solar Nebular Organics
L. Ilsedore Cleeves, Edwin A. Bergin, Conel M. O'D. Alexander +4
Deuterium-to-hydrogen (D/H) enrichments in molecular species provide clues about their original formation environment. The organic materials in primitive solar system bodies have g…
The Compositional Structure of the Asteroid Belt
Francesca E. DeMeo, Conel M. O'D. Alexander, Kevin J. Walsh +2
The past decade has brought major improvements in large-scale asteroid discovery and characterization with over half a million known asteroids and over 100,000 with some measuremen…
The ancient heritage of water ice in the solar system
L. Ilsedore Cleeves, Edwin A. Bergin, Conel M. O'D. Alexander +4
Identifying the source of Earth's water is central to understanding the origins of life-fostering environments and to assessing the prevalence of such environments in space. Water…
Cosmochemical Consequences of Particle Trajectories During FU Orionis Outbursts by the Early Sun
Alan P. Boss, Conel M. O'D. Alexander, Morris Podolak
The solar nebula is thought to have undergone a number of episodes of FU Orionis outbursts during its early evolution. We present here the first calculations of the trajectories of…
A transmission electron microscopy study of presolar hibonite
Thomas J. Zega, Conel M. O'D. Alexander, Larry R. Nittler +1
We report isotopic and microstructural data on five presolar hibonite grains identified in an acid residue of the Krymka LL3.1 ordinary chondrite. Isotopic measurements by secondar…
Coordinated Analyses of Presolar Grains in the Allan Hills 77307 and Queen Elizabeth Range 99177 Meteorites
Ann N. Nguyen, Larry R. Nittler, Frank J. Stadermann +2
We report the identification of presolar silicates (~177 ppm), presolar oxides (~11 ppm), and one presolar SiO2 grain in the Allan Hills (ALHA) 77307 chondrite. Three grains having…