Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites

Fujiya, W., Hoppe, P., Ushikubo, T., Fukuda, K., Lindgren, P., Lee, M.R. , Koike, M., Shirai, K. and Sano, Y. (2019) Migration of D-type asteroids from the outer Solar System inferred from carbonate in meteorites. Nature Astronomy, 3(10), pp. 910-915. (doi:10.1038/s41550-019-0801-4)

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Abstract

Recent dynamical models of Solar System evolution and isotope studies of rock-forming elements in meteorites have suggested that volatile-rich asteroids formed in the outer Solar System beyond Jupiter’s orbit, despite being currently located in the main asteroid belt. The ambient temperature under which asteroids formed is a crucial diagnostic to pinpoint the original location of asteroids and is potentially determined by the abundance of volatiles they contain. In particular, abundances and 13C/12C ratios of carbonates in meteorites record the abundances of carbon-bearing volatile species in their parent asteroids. However, the sources of carbon for these carbonates remain poorly understood. Here we show that the Tagish Lake meteorite contains abundant carbonates with consistently high 13C/12C ratios. The high abundance of 13C-rich carbonates in Tagish Lake excludes organic matter as their main carbon source. Therefore, the Tagish Lake parent body, presumably a D-type asteroid, must have accreted a large amount of 13C-rich CO2 ice. The estimated 13C/12C and CO2/H2O ratios of ice in Tagish Lake are similar to those of cometary ice. Thus, we infer that at least some D-type asteroids formed in the cold outer Solar System and were subsequently transported into the inner Solar System owing to an orbital instability of the giant planets.

Item Type:Articles (Letter)
Additional Information:This work was supported by JSPS KAKENHI grant numbers 16K17838, 17K18814 and 18H04454, and UK Science and Technology Facilities Council grant ST/N000846/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lee, Professor Martin
Authors: Fujiya, W., Hoppe, P., Ushikubo, T., Fukuda, K., Lindgren, P., Lee, M.R., Koike, M., Shirai, K., and Sano, Y.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Nature Astronomy
Publisher:Nature Research
ISSN:2397-3366
ISSN (Online):2397-3366
Published Online:01 July 2019
Copyright Holders:Copyright © 2019 The Authors, under exclusive licence to Springer Nature Limited
First Published:First published in Nature Astronomy 3:910-915
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
697411A journey from the solar nebula to planetary bodies: cycling of heat, water and organicsMartin LeeScience & Technology Facilities Council (STFC)ST/N000846/1GES - GES ADMINISTRATION