کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487391 | 1523497 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sublimation of cometary ices in the presence of organic volatiles
ترجمه فارسی عنوان
تصفیه یخ های کمیته در حضور فرآورده های ارگانیک
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کلمات کلیدی
دنباله دار هسته ستاره دنباله دار، ترکیب کمیته، ایسس،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
Evolution of the surfaces of cometary nuclei is determined by the sublimation of ice. The rate of sublimation is commonly calculated using the simple Hertz-Knudsen formula, which should be corrected by a temperature dependent sublimation coefficient αs (Kossacki et al., 1999; Gundlach et al., 2011; Kossacki and Leliwa-Kopystynski, 2014). In this work influence of C3H6O (acetone), and CH3OH (methanol) present in cometary ice on the sublimation coefficient is investigated. We have found, that the mass fraction of admixtures ⤠2% in water ice is sufficient for an increase of αs by a factor about 5, depending on the temperature. The sublimation coefficient is sensitive to very small concentrations of admixtures. When the admixture is acetone and the mass fraction f=0.005 is αs(215âK) â¼ 0.46 instead of â¼ 0.18 for pure water ice. When f=0.01 is αs(215âK) â¼ 0.74, and when f=0.02 is αs(215âK) â¼ 0.78. The presence of 0.01 mass fraction of methanol has similar influence on the sublimation coefficient as the presence of 0.01 mass fraction of acetone. At temperatures T > 235 K for all investigated compositions of ice αs â¼ 0.15.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 294, 15 September 2017, Pages 227-233
Journal: Icarus - Volume 294, 15 September 2017, Pages 227-233
نویسندگان
Konrad J. Kossacki, Jacek Leliwa-Kopystynski, Piotr Witek, Aleksander Jasiak, Adrian Dubiel,