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WATER IN COMET C/2003 K4 (LINEAR) WITH SPITZER

机译:带有SPITZER的COMET C / 2003 K4(线性)中的水

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摘要

We present sensitive 5.5-7.6 μm spectra of comet C/2003 K4 (LINEAR) obtained on 2004 July 16 (r_h = 1.760 AU, △_(Spitzer) = L409 AU, phase angle = 35.4°) with the Spitzer Space Telescope. The v_2 vibrational band of water is detected with a high signal-to-noise ratio ((approw > )50). Model fitting to the best spectrum yields a water ortho-to-para ratio of 2.47 ± 0.27, which corresponds to a spin temperature of 28.5_(-3.5)~(+6.5). Spectra acquired at different offset positions show that the rotational temperature decreases with increasing distance from the nucleus, which is consistent with evolution from thermal to fluorescence equilibrium. The inferred water production rate is (2.43 ± 0.25) × 10~(29) molecules s~(-1). The spectra 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). However, residual emission is observed near 7.3 μm, the origin of which remains unidentified.
机译:我们展示了使用Spitzer空间望远镜在2004年7月16日获得的彗星C / 2003 K4(LINEAR)的敏感5.5-7.6μm光谱(r_h = 1.760 AU,△_(Spitzer)= L409 AU,相角= 35.4°)。检测到水的v_2振动带具有很高的信噪比((approw>)50)。拟合到最佳光谱的模型产生的水原位与对位之比为2.47±0.27,这对应于28.5 _(-3.5)〜(+6.5)的旋转温度。在不同偏移位置获得的光谱表明,旋转温度随着与原子核距离的增加而降低,这与从热平衡到荧光平衡的演变是一致的。推断出的产水率为(2.43±0.25)×10〜(29)分子s〜(-1)。与9P / Tempel 1和C / 1995 O1彗星(Hale-Bopp)的报告结果相反,该光谱没有显示出多环芳烃和碳酸盐矿物发出任何证据。但是,在7.3μm附近观察到残留发射,其起源尚未确定。

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