کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8137136 | 1523543 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observations of sodium in the coma of Comet C/2012 S1 (ISON) during outburst
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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![عکس صفحه اول مقاله: Observations of sodium in the coma of Comet C/2012 S1 (ISON) during outburst Observations of sodium in the coma of Comet C/2012 S1 (ISON) during outburst](/preview/png/8137136.png)
چکیده انگلیسی
Prior to disintegration near its 2.7Â Râ perihelion, the dynamically new Comet C/2012 S1(ISON) briefly exhibited resonantly scattered sodium emission at the 5890Â Ã
and 5896Â Ã
D lines. In this work, we report a rapid increase in sodium production of >3à between observations made only one day apart and the first observations of cometary sodium during an outburst. Mean Na production is estimated at 1.6 ± 0.3 Ã 1023 atoms sâ1 on UT 19.5 Nov 2013 and 5.8 ± 1 Ã 1023 atoms sâ1 on UT 20.5. At a heliocentric distance of 0.44 AU, the anti-sunward Na tail was detected >106 km from the nucleus. Surprisingly, these production rates are well below those of any previously determined when Na is seen from a comet. Accurately reproducing the emission in the Na tail on UT 20.5 Nov 2013 requires a source near the nucleus that varies with time due to the outburst. Data prior to outburst one day earlier can be reproduced if nearly half of total sodium production is attributed to an extended source such as dust grains. This suggests sources of sodium vapor in cometary coma are sensitive to the dust to gas ratio.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 247, February 2015, Pages 313-318
Journal: Icarus - Volume 247, February 2015, Pages 313-318
نویسندگان
Carl A. Schmidt, Robert E. Johnson, Jeffrey Baumgardner, Michael Mendillo,