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Fingerprints of the protosolar cloud collapse in the Solar System: Refractory inclusions distribution and isotopic anomalies in meteorites

Published online by Cambridge University Press:  12 October 2020

Francesco C. Pignatale Open the ORCID record for Francesco C. Pignatale [Opens in a new window] ,
Emmanuel Jacquet ,
Marc Chaussidon  and
Sébastien Charnoz
Francesco C. Pignatale
Affiliation:
Muséum national d’Histoire naturelle, Institut de Minéralogie, Physique des Matériaux et de Cosmochimie, Département Origines et Evolution, UMR 7590, CP52, 57 rue Cuvier, 75005, Paris, France email: pignatale@ipgp.fr Université de Paris, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France
Emmanuel Jacquet
Affiliation:
Muséum national d’Histoire naturelle, Institut de Minéralogie, Physique des Matériaux et de Cosmochimie, Département Origines et Evolution, UMR 7590, CP52, 57 rue Cuvier, 75005, Paris, France email: pignatale@ipgp.fr
Marc Chaussidon
Affiliation:
Université de Paris, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France
Sébastien Charnoz
Affiliation:
Université de Paris, Institut de Physique du Globe de Paris, CNRS, 1 rue Jussieu, 75005 Paris, France
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Abstract

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Increasing evidences suggest that the building blocks of Ca-Al-rich inclusions (CAIs) could have formed with the Sun, during the collapse of the parent cloud. However, determination of the relative age of CAIs relies on the homogeneous distribution of their short-lived radionuclide 26Al that is used as a chronometer. Some CAIs show evidence of 26Al/27 Al variation that is independent of decay.

We investigate the dynamical and chemical evolution of refractories from the collapsing cloud to their transport in the protoplanetary disk focusing to the predicted isotopic anomalies resulting from 26Al heterogeneities.

The interplay between the thermal properties of the dust, the isotopic zoning in the cloud and disk dynamics produce aggregates that resemble chondrites. An abrupt raise of 26Al close the center of the cloud followed by a plateau throughout the cloud best matches the observations. As a consequence, the 26Al -chronometer retains validity from the formation of canonical CAIs onward.

Keywords

astrochemistrysolar system: formationmeteor meteoroids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 100 - 102
Copyright
© International Astronomical Union 2020

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