WATER IN COMETS 71P/CLARK AND C/2004 B1 (LINEAR) WITH SPITZER
WATER IN COMETS 71P/CLARK AND C/2004 B1 (LINEAR) WITH SPITZER
复制标题
彗星 71P/CLARK 和 C/2004 B1（线性）中的水与斯皮策望远镜
DOI：
10.1088/0004-637x/696/2/1075
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
D. Wooden
中科院分区：
文献类型：
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作者：
D. Bockelée;C. Woodward;M. Kelley;D. Wooden
我们提供了用斯皮策太空望远镜获得的彗星71 P/Clark（2006年5月27.56 UT，近日点前rh = 1.57 Au）和C/2004 B1（LINEAR）（2005年10月15.22 UT，近日点前rh = 2.21 Au，近日点后rh = 2.06 Au）的5.5-7.6 μm光谱。探测到水的ν2振动带，信噪比为11-50。使用水发射的荧光模型拟合光谱，得出71 P/Clark的水旋转温度< 18 K，C/2004 B1的水旋转温度为14 ± 2 K（近日点前）和23 ± 4 K（近日点后）（线性）。在C/2004 B1（线性）中测得水的邻位与帕拉比为2.31 ± 0.18，对应的自旋温度为26+3−2 K。水的生产率。水模型和测量之间的协议是好的，如先前发现的斯皮策光谱的C/2003 K4（线性）。这三颗彗星的斯皮策光谱没有显示出任何证据表明多环芳烃和碳酸盐矿物的排放，与彗星9 P/Tempel 1和C/1995 O 1（Hale-Bopp）的结果相反。
We present 5.5–7.6 μm spectra of comets 71P/Clark (2006 May 27.56 UT, rh = 1.57 AU pre-perihelion) and C/2004 B1 (LINEAR) (2005 October 15.22 UT, rh = 2.21 AU pre-perihelion and 2006 May 16.22 UT, rh = 2.06 AU post-perihelion) obtained with the Spitzer Space Telescope. The ν2 vibrational band of water is detected with a signal-to-noise ratio of 11–50. Fitting the spectra using a fluorescence model of water emission yields a water rotational temperature of < 18 K for 71P/Clark and ≃14 ± 2 K (pre-perihelion) and 23 ± 4 K (post-perihelion) for C/2004 B1 (LINEAR). The water ortho-to-para ratio in C/2004 B1 (LINEAR) is measured to be 2.31 ± 0.18, which corresponds to a spin temperature of 26+3−2 K. Water production rates are derived. The agreement between the water model and the measurements is good, as previously found for Spitzer spectra of C/2003 K4 (LINEAR). The Spitzer spectra of these three comets do not show any evidence for emission from polycyclic aromatic hydrocarbons and carbonate minerals, in contrast to results reported for comets 9P/Tempel 1 and C/1995 O1 (Hale-Bopp).