A Perspective from Extinct Radionuclides on a Young Stellar Object: The Sun and Its Accretion Disk

By N. Dauphas, M. Chaussidon. 2011

173 citations recorded by the source corpus.

Meteorites, which are remnants of solar system formation, provide a direct glimpse into the dynamics and evolution of a young stellar object (YSO), namely our Sun. Much of our knowledge about the astrophysical context of the birth of the Sun, the chronology of planetary growth from micrometer- sized dust to terrestrial planets, and the activity of the young Sun comes from the study of extinct radionuclides such as 26 Al (t1/2 = 0.717 Myr). Here we review how the signatures of extinct radionuclides (short-lived isotopes that were present when the solar system formed and that have now decayed below detection level) in planetary materials influence the current paradigm of solar system formation. Particular attention is given to tying meteorite measurements to remote astronomical observations of YSOs and modeling efforts. Some extinct radionuclides were inherited from the long-term chem- ical evolution of the Galaxy, others were injected into the solar system by a nearby supernova, and some were produced by particle irradiation from the T-Tauri Sun. The chronology inferred from extinct radionuclides reveals that dust agglomeration to form centimeter-sized particles in the inner part of the disk was very rapid (<50 kyr), planetesimal formation started early and spanned several million years, planetary embryos (possibly like Mars) were formed in a few million years, and terrestrial planets (like Earth) completed their growths several tens of million years after the birth of the Sun.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/8a1b9edf2c68e5b66a68b2e6ca5c31fd2882c9c8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. F. Ciesla
2. L. Nittler
3. Cecilia Ceccarelli
4. P. Caselli
5. N. Dauphas
6. C. Burkhardt
7. Haolan Tang
8. H. Kobayashi

Citations in the corpus

• Abundance, distribution, and origin of 60Fe in the solar protoplanetary disk (2012, background): “The timing of formation of these objects is not precisely known but most chondrules in ordinary chondrites were formed 2.4±2.0 Myr after CAI (Kita et al., 2005; Yin et al., 2007; Nyquist et al., 2009; Villeneuve et al., 2009; Dauphas and Chaussidon, 2011).”
• HETEROGENEOUS DISTRIBUTION OF 26Al AT THE BIRTH OF THE SOLAR SYSTEM (2010, background): “1948 Meteoritics & Planetary Science 47, Nr 12, 1948–1979 (2012) doi: 10.1111/maps.12008 chondrule formation, melting and differentiation of planetesimals (e.g., McKeegan and Davis 2003; Kita et al. 2005; Nyquist et al. 2009; Dauphas and Chaussidon 2011 and references therein).”
• Astrophysics with Extraterrestrial Materials (2016, background): “Some important examples include 26Al (half-life = 7.2×105 years), 129I (1.6 × 107 years), 60Fe (2.6×106 years), 53Mn (3.7×106 years), and 182Hf (8.9×106 years) (for recent reviews, see Dauphas & Chaussidon 2011, Davis & McKeegan 2014).”
• Planetary and meteoritic Mg/Si and δ30Si variations inherited from solar nebula chemistry (2015, background): “Much of the material accreted in the first ~3 Myr of the formation of the solar system would have acquired enough (26)Al to melt from the heat produced by decay of this short-lived radionuclide (Grimm and McSween, 1993; Dauphas and Chaussidon, 2011).”
• Our astrochemical heritage (2012, background): “As a consequence, theories based on (60)Fe have to be taken with a grain of salt (see the review by [127]).”