INWARD RADIAL MIXING OF INTERSTELLAR WATER ICES IN THE SOLAR PROTOPLANETARY DISK

Astrophysical Journal Letters - Tập 827 Số 1 - Trang L1 - 2016
Lionel Vacher1, Yves Marrocchi1, Maximilien Verdier‐Paoletti2, Johan Villeneuve1, M. Gounelle2,3
1CRPG, CNRS, Université de Lorraine, UMR 7358, Vandoeuvre-lés-Nancy, F-54501, France
2IMPMC, MNHN, UPMC, UMR CNRS 7590, 61 rue Buffon, F-75005 Paris, France
3Institut Universitaire de France, Maison des Universités, 103 Boulevard Saint-Michel, F-75005 Paris, France

Tóm tắt

ABSTRACT The very wide diversity of asteroid compositions in the main belt suggests significant material transport in the solar protoplanetary disk and hints at the presence of interstellar ices in hydrated bodies. However, only a few quantitative estimations of the contribution of interstellar ice in the inner solar system have been reported, leading to considerable uncertainty about the extent of radial inward mixing in the solar protoplanetary disk 4.56 Ga ago. We show that the pristine CM chondrite Paris contains primary Ca-carbonates whose O-isotopic compositions require an 8%–35% contribution from interstellar water. The presence of interstellar water in Paris is confirmed by its bulk D/H isotopic composition that shows significant D enrichment (D/H = (167 ± 0.2) × 10−6) relative to the mean D/H of CM chondrites ((145 ± 3) × 10−6) and the putative D/H of local CM water ((82 ± 1.5) × 10−6). These results imply that (i) efficient radial mixing of interstellar ices occurred from the outer zone of the solar protoplanetary disk inward and that (ii) chondrites accreted water ice grains from increasing heliocentric distances in the solar protoplanetary disk.

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Astrophysical Journal Letters

Tập 827 Số 1

L1

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