TY  - JOUR
AU  - Dartois E, Engrand C.
PY  - 2013//
TI  - UltraCarbonaceous Antarctic micrometeorites, probing the Solar System beyond the nitrogen snow-line
JO  - Icarus
SP  - 243
EP  - 252
VL  - 224
IS  - 1
KW  - Origin
KW  - Solar System
KW  - Interplanetary dust
KW  - Cosmochemistry
KW  - Cosmic rays
KW  - Organic chemistry
KW  -
N2  - The current Solar System architecture is aheritage of the protoplanetary disk that surrounded the youngSun, 4.56 Gy ago. Primitive extraterrestr ial objects provide means to trace back the primordial composi-tion and radial distribution of matter in this disk. Here, we present acombined micro-IR, Raman, chem-ical and isotopic study of two ultracarbonaceous micrometeorites recovered from Antar ctica (UCAMMs).This study reveals particles containing an unusually high nitrogen- and deuterium-rich organic matteranalogous to a polyaromatic hydrogenated carbon nitride, characterized by nitrogen concentration withbulk atomic N/C ratios of 0.05 and 0.12 (locallyexceeding 0.15).We propose that such nitrogen-rich car-bonaceous material can be formed by energetic irradiations of nitrogen-rich ices in very low temperatureregions of the Solar System. Such conditions are encountered at the surface of small objects beyond thetrans-neptunian region. UCAMMs provide unique insights on physico-chemical processes that occurredbeyond the nitrogen snow-line, revealing orga nic material from the extreme outer regions of the SolarSystem that cannot be investigated by remote sensing methods.
SN  - 0019-1035
UR  - http://dx.doi.org/10.1016/j.icarus.2013.03.002
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=4827), last updated on Sat, 06 Jul 2024 08:54:35 +0200
ID  - DartoisE2013
ER  -