71 P/Clark和C/2004 B1（LINEAR）彗星中的水
Water in Comets 71P/Clark and C/2004 B1 (LINEAR) with Spitzer
摘要：
我们提出了5.5至7.6微米的光谱彗星71 P/克拉克（2006年5月27.56 UT，r_h = 1.57 AU preperimelion）和C/2004 B1（LINEAR）（2005年10月15.22 UT，r_h = 2.21 AU前近日点和2006年5月16.22 UT，r_h = 2.06 AU后近日点）获得的斯皮策太空望远镜。水的nu_2振动带以11至50的信噪比被检测。使用水发射的荧光模型拟合光谱，得到71 P/Clark的水旋转温度< 18 K，C/2004 B1的水旋转温度大约小于或等于14 +/- 2 K（近日点前）和23 +/- 4 K（近日点后）（线性）。在C/2004 B1（LINEAR）中测得水的邻位与对位比为2.31 +/- 0.18，这对应于26^{+3}_{-2} K的自旋温度。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来自多环芳烃和碳酸盐矿物的排放证据，与彗星9 P/Tempel~1和C/1995 O 1（Hale-Bopp）的结果相反。
英文摘要：
We present 5.5 to 7.6 micron spectra of comets 71P/Clark (2006 May 27.56 UT, r_h = 1.57 AU pre-perihelion) and C/2004 B1 (LINEAR) (2005 October 15.22 UT, r_h = 2.21 AU pre-perihelion and 2006 May 16.22 UT, r_h = 2.06 AU post-perihelion) obtained with the Spitzer Space Telescope. The nu_2 vibrational band of water is detected with a signal-to-noise ratio of 11 to 50. Fitting the spectra using a fluorescence model of water emission yields a water rotational temperature of < 18 K for 71P/Clark and approximately less than or equivalent to 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 PAHs and carbonate minerals, in contrast to results reported for comets 9P/Tempel~1 and C/1995 O1 (Hale-Bopp).
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