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

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 asteroid10, 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.

Hoppe, PeterMax Planck Institute for Chemistry (author)
Ushikubo, T.Japan Agency for Marine-Earth Science and Technology (author)
Fukuda, K.University of Wisconsin-Madison,University of Tokyo (author)
Lindgren, PaulaLund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science(Swepub:lu)pa7274li (author)
Lee, MartinUniversity of Glasgow (author)
Koike, M.Japan Aerospace Exploration Agency (JAXA),University of Tokyo (author)
Shirai, K.University of Tokyo (author)
Sano, Y.University of Tokyo (author)
Ibaraki UniversityMax Planck Institute for Chemistry (creator_code:org_t)

In:Nature Astronomy: Springer Science and Business Media LLC3:10, s. 910-9152397-3366

By the author/editor: Fujiya, Wataru; Hoppe, Peter; Ushikubo, T.; Fukuda, K.; Lindgren, Paula; Lee, Martin; show more...; Koike, M.; Shirai, K.; Sano, Y.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geochemistry

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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