کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4680118 1634910 2007 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Time-dependent oxygen isotopic effects of CO self shielding across the solar protoplanetary disk
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Time-dependent oxygen isotopic effects of CO self shielding across the solar protoplanetary disk
چکیده انگلیسی

Optically thin surfaces of the solar circumstellar disk were likely sites for generating 16O isotope variability in the early Solar System. Astrochemical reaction network calculations predict that a robust feature of these photoactive horizons of the disk was conversion of CO gas to 16O-poor (high Δ17O) H2O ice on a timescale of 105 yr. Within several AU of the central star ultraviolet fluxes were too great for the oxygen isotopic effects of CO photodissociation to be sequestered in H2O, meaning that the CO self shielding oxygen isotopic effect was an outer disk phenomenon. Calculations depicting transport in the circumstellar disk suggest that CO photodissociation at disk surfaces triggered a wave of high-Δ17O H2O that passed from surface regions through the outer disk and into the rocky planet-forming region on a timescale of 105 to 106 yr.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 262, Issues 3–4, 30 October 2007, Pages 468–483
نویسندگان
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