Presolar graphite in meteorites

Sachiko Amari; Manavi Jadhav

doi:10.1016/B978-0-12-821830-3.00008-5

Presolar graphite in meteorites

Sachiko Amari
, Manavi Jadhav

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

Presolar graphite is the carrier of Ne-E(L), a 22Ne-rich component, and is present only in very primitive chondrites, including Murchison and Orgueil. Graphite grains have a range of densities from 1.6 to 2.2g/cm3. Many low-density grains (1.6∼2±0.1g/cm3) show 18O excesses, Si isotopic anomalies, and high 26Al/27Al ratios that indicate they originated from Type II supernovae. A significant portion of high-density graphite grains (2±0.1∼2.2g/cm3) was produced in low-metallicity asymptotic giant branch (AGB) stars as characterized by high 12C/13C ratios, Si isotopic distribution that agrees with the evolution of Si in those stars, and high s-process 86Kr/82Kr. Other possible stellar sources include born-again AGB stars, J-stars, and novae. This review provides a comprehensive overview of the past, and current state of research on presolar graphite grains.

Original language	English
Title of host publication	Presolar Grains in Extra-Terrestrial Materials
Subtitle of host publication	Probing Stars with Stardust
Publisher	Elsevier
Pages	97-160
Number of pages	64
ISBN (Electronic)	9780128218303
ISBN (Print)	9780128218310
DOIs	https://doi.org/10.1016/B978-0-12-821830-3.00008-5
State	Published - Jan 1 2025

Keywords

Born-again AGB stars
Graphite
J-stars
Low-metallicity AGB stars
Noble gases
Novae
Post-AGB stars
Presolar grains
Secondary ion mass spectrometry
Supernovae

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10.1016/B978-0-12-821830-3.00008-5

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title = "Presolar graphite in meteorites",

abstract = "Presolar graphite is the carrier of Ne-E(L), a 22Ne-rich component, and is present only in very primitive chondrites, including Murchison and Orgueil. Graphite grains have a range of densities from 1.6 to 2.2g/cm3. Many low-density grains (1.6∼2±0.1g/cm3) show 18O excesses, Si isotopic anomalies, and high 26Al/27Al ratios that indicate they originated from Type II supernovae. A significant portion of high-density graphite grains (2±0.1∼2.2g/cm3) was produced in low-metallicity asymptotic giant branch (AGB) stars as characterized by high 12C/13C ratios, Si isotopic distribution that agrees with the evolution of Si in those stars, and high s-process 86Kr/82Kr. Other possible stellar sources include born-again AGB stars, J-stars, and novae. This review provides a comprehensive overview of the past, and current state of research on presolar graphite grains.",

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AU - Amari, Sachiko

AU - Jadhav, Manavi

PY - 2025/1/1

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N2 - Presolar graphite is the carrier of Ne-E(L), a 22Ne-rich component, and is present only in very primitive chondrites, including Murchison and Orgueil. Graphite grains have a range of densities from 1.6 to 2.2g/cm3. Many low-density grains (1.6∼2±0.1g/cm3) show 18O excesses, Si isotopic anomalies, and high 26Al/27Al ratios that indicate they originated from Type II supernovae. A significant portion of high-density graphite grains (2±0.1∼2.2g/cm3) was produced in low-metallicity asymptotic giant branch (AGB) stars as characterized by high 12C/13C ratios, Si isotopic distribution that agrees with the evolution of Si in those stars, and high s-process 86Kr/82Kr. Other possible stellar sources include born-again AGB stars, J-stars, and novae. This review provides a comprehensive overview of the past, and current state of research on presolar graphite grains.

AB - Presolar graphite is the carrier of Ne-E(L), a 22Ne-rich component, and is present only in very primitive chondrites, including Murchison and Orgueil. Graphite grains have a range of densities from 1.6 to 2.2g/cm3. Many low-density grains (1.6∼2±0.1g/cm3) show 18O excesses, Si isotopic anomalies, and high 26Al/27Al ratios that indicate they originated from Type II supernovae. A significant portion of high-density graphite grains (2±0.1∼2.2g/cm3) was produced in low-metallicity asymptotic giant branch (AGB) stars as characterized by high 12C/13C ratios, Si isotopic distribution that agrees with the evolution of Si in those stars, and high s-process 86Kr/82Kr. Other possible stellar sources include born-again AGB stars, J-stars, and novae. This review provides a comprehensive overview of the past, and current state of research on presolar graphite grains.

KW - Born-again AGB stars

KW - Graphite

KW - J-stars

KW - Low-metallicity AGB stars

KW - Noble gases

KW - Novae

KW - Post-AGB stars

KW - Presolar grains

KW - Secondary ion mass spectrometry

KW - Supernovae

UR - https://www.scopus.com/pages/publications/105005922373

U2 - 10.1016/B978-0-12-821830-3.00008-5

DO - 10.1016/B978-0-12-821830-3.00008-5

M3 - Chapter

AN - SCOPUS:105005922373

SN - 9780128218310

SP - 97

EP - 160

BT - Presolar Grains in Extra-Terrestrial Materials

PB - Elsevier

ER -

Presolar graphite in meteorites

Abstract

Keywords

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