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Origin of the p-process radionuclides ⁹²Nb and ¹⁴⁶Sm in the early solar system and inferences on the birth of the Sun

Lugaro, Maria; Pignatari, Marco; Ott, Ulrich; Zuber, Kai; Travaglio, Claudia; Gyürky, György; Fülöp, Zsolt

Authors

Maria Lugaro

Ulrich Ott

Kai Zuber

Claudia Travaglio

György Gyürky

Zsolt Fülöp

Abstract

The abundances of ⁹²Nb and ¹⁴⁶Sm in the early solar system are determined from meteoritic analysis, and their stellar production is attributed to the p process. We investigate if their origin from thermonuclear supernovae deriving from the explosion of white dwarfs with mass above the Chandrasekhar limit is in agreement with the abundance of ⁵³Mn, another radionuclide present in the early solar system and produced in the same events. A consistent solution for ⁹²Nb and ⁵³Mn cannot be found within the current uncertainties and requires the ⁹²Nb/⁹²Mo ratio in the early solar system to be at least 50% lower than the current nominal value, which is outside its present error bars. A different solution is to invoke another production site for ⁹²Nb, which we find in the α-rich freezeout during core-collapse supernovae from massive stars. Whichever scenario we consider, we find that a relatively long time interval of at least ∼10 My must have elapsed from when the star-forming region where the Sun was born was isolated from the interstellar medium and the birth of the Sun. This is in agreement with results obtained from radionuclides heavier than iron produced by neutron captures and lends further support to the idea that the Sun was born in a massive star-forming region together with many thousands of stellar siblings.

Journal Article Type Article
Publication Date Jan 26, 2016
Journal Proceedings of the National Academy of Sciences - PNAS
Print ISSN 0027-8424
Electronic ISSN 1091-6490
Publisher National Academy of Sciences
Peer Reviewed Peer Reviewed
Volume 113
Issue 4
Pages 907-912
Institution Citation Lugaro, M., Pignatari, M., Ott, U., Zuber, K., Travaglio, C., Gyürky, G., & Fülöp, Z. (2016). Origin of the p-process radionuclides ⁹²Nb and ¹⁴⁶Sm in the early solar system and inferences on the birth of the Sun. Proceedings of the National Academy of Sciences of the United States of America, 113(4), 907-912. https://doi.org/10.1073/pnas.1519344113
DOI https://doi.org/10.1073/pnas.1519344113
Keywords Short-lived radionuclides , Solar system formation, Supernovae
Publisher URL http://www.pnas.org/content/113/4/907
Copyright Statement ©2016 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder
Additional Information Copy of article first published in: Proceedings of the National Academy of Sciences - PNAS, 2016, v.113, issue 4

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Copyright Statement
©2016 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder



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