On the Nucleosynthetic Origin of Presolar Silicon Carbide X-Grains
by Waheed Akram, Oliver Hallmann, Bernd Pfeiffer and Karl-Ludwig Kratz Universe, Volume 8, Issue 12Published: 28 November 2022 LINK (OPEN ACCESS)PDF (DOWNLOAD) “In this paper we present an extension of our nucleosynthesis parameter study within…
Slow Neutron-Capture Process: Low-Mass Asymptotic Giant Branch Stars and Presolar Silicon Carbide GrainsOPEN ACCESS
Nan Liu, Sergio Cristallo, Diego Vescovi Universe 2022, 8(7), 362Review, Published: 30 June 2022 LINK (OPEN ACCESS)PDF (OPEN ACCESS) “Presolar grains are microscopic dust grains that formed in the stellar winds or explosions of ancient…
Evaluation of the classification of presolar silicon carbide grains using consensus clustering with resampling methods: an assessment of the confidence of grain assignments
Grethe Hystad, Asmaa Boujibar, Nan Liu, Larry R Nittler, Robert M Hazen Monthly Notices of the Royal Astronomical Society, stab3478Published: 03 December 2021 LINK “We report the use of several cluster analysis techniques to evaluate…
TEM Analyses of Unusual Presolar Silicon Carbide: Insights into the Range of Circumstellar Dust Condensation ConditionsOPEN ACCESS
S. A. Singerling, N. Liu, L. R. Nittler, C. M. O’D. Alexander, and R. M. Stroud The Astrophysical Journal, Volume 913, Number 2Published: 27 May 2021 LINK Update (31 May 2021): PDF (OPEN ACCESS)63 pages,…
The Presolar Grain Database for Silicon Carbide — Grain Type Assignments
Stephan T., Bose M., Boujibar A., Davis A. M., Gyngard F. et al. 52nd Lunar and Planetary Science Conference (2021), Abstract #2358 PDF “The updated Presolar Grain Database now contains data for 19,976 SiC grains….
A Presolar Silicon Carbide Grain of Type C with Extremely Low 12C/13C Ratio
P. Hoppe, Schofield J., Pignatari M., Amari S. 52nd Lunar and Planetary Science Conference (2021), Abstract #1055 PDF “We report on a presolar SiC grain of Type C with an extremely low 12C/13C ratio of…
Sputtering of Presolar Grains via Galactic Cosmic Rays in the Interstellar Medium
Akshat Garg, Kuljeet K. Marhas, and Vikram Goyal The Astrophysical Journal, Volume 905, Number 1Published: 2020 December 15 LINK “The sputtering rate of presolar silicon carbide grains due to galactic cosmic rays has been computed…
Cluster analysis of presolar silicon carbide grains: evaluation of their classification and astrophysical implicationsOPEN ACCESS
Asmaa Boujibar, Samantha Howell, Shuang Zhang, Grethe Hystad, Anirudh Prabhu, Nan Liu, Thomas Stephan, Shweta Narkar, Ahmed Eleish, Shaunna M. Morrison, Robert M. Hazen, Larry R. Nittler accepted at ApJL PDF (OPEN ACCESS) “Cluster analysis…
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbideOPEN ACCESS
Philipp R. Heck, Jennika Greer, Levke Kööp, Reto Trappitsch, Frank Gyngard, Henner Busemann, Colin Maden, Janaína N. Ávila, Andrew M. Davis, and Rainer Wieler PNAS, first published January 13, 2020 LINK (OPEN ACCESS) PDF (OPEN…
Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14N/15N Ratios
Peter Hoppe, Richard J. Stancliffe, Marco Pignatari, and Sachiko Amari The Astrophysical Journal, Volume 887, Number 1 LINK “We report high-resolution C, N, Al, Si, and S isotope data of 38 presolar SiC grains of…
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar OriginsOPEN ACCESS
Nan Liu, Thomas Stephan, Sergio Cristallo, Roberto Gallino, Patrick Boehnke, Larry R. Nittler, Conel M. O.’D. Alexander, Andrew M. Davis, Reto Trappitsch, Michael J. Pellin, Iris Dillmann The Astrophysical Journal (Accepted) PDF (OPEN ACCESS) Update…
Molybdenum Isotopes in Presolar Silicon Carbide Grains: Details of s-process Nucleosynthesis in Parent Stars and Implications for r- and p-processes
Thomas Stephan, Reto Trappitsch, Peter Hoppe, Andrew M. Davis, Michael J. Pellin, and Olivia S. Pardo The Astrophysical Journal, Volume 877, Number 2 LINK “We have analyzed molybdenum isotopes, together with strontium and barium isotopes,…
Structural Investigation of Silicon Carbide X Grains: Constraints on Condensation in Supernova Ejecta
János Kodolány, Christian Vollmer, Peter Hoppe, and Maren Müller The Astrophysical Journal Volume 868, Number 1 LINK “We analyzed seven presolar SiC grains of supernova origin (average diameter: 1–2 μm) with transmission electron microscopy. Five…
Late formation of silicon carbide in type II supernovaeOPEN ACCESS
Nan Liu, Larry R. Nittler, Conel M. O’D. Alexander and Jianhua Wang Science Advances 17 Jan 2018: Vol. 4, no. 1, eaao1054 DOI: 10.1126/sciadv.aao1054 LINK (OPEN ACCESS) PDF (OPEN ACCESS) “We have found that individual…
Transition Elements in Supernova Presolar Grains: Condensation versus Implantation
Kuljeet K. Marhas and Piyush Sharda The Astrophysical Journal, Volume 853, Number 1 LINK “We compute the concentrations of five transition elements (Cr, Fe, Co, Ni, and Zn) via condensation and implantation in supernova presolar…
Coordinated EDX and micro-Raman analysis of presolar silicon carbide: A novel, nondestructive method to identify rare subgroup SiC
Replaced (7 August 2020) by: Coordinated EDX and micro‐Raman analysis of presolar silicon carbide: A novel, nondestructive method to identify rare subgroup SiC Nan Liu, Andrew Steele, Larry R. Nittler, Rhonda M. Stroud, Bradley T….
Do meteoritic silicon carbide grains originate from asymptotic giant branch stars of super-solar metallicity?
Maria Lugaro, Amanda I. Karakas, Mária Pető, Emese Plachy Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 8 June 2017 LINK “We compare literature data for the isotopic ratios of Zr, Sr, and…
NanoSIMS Isotope Studies of Rare Types of Presolar Silicon Carbide Grains from the Murchison Meteorite: Implications for Supernova Models and the Role of 14C
Peter Hoppe, Marco Pignatari, János Kodolányi, Elmar Gröner, Sachiko Amari Geochimica et Cosmochimica Acta In Press, Accepted Manuscript, Available online 9 February 2017 LINK “We have conducted a NanoSIMS ion imaging survey of about 1800…
