C/2009 P1 Garrdd彗星2011年出现期间的不相关波动行为
Uncorrelated Volatile Behavior During the 2011 Apparition of Comet C/2009 P1 Garradd
摘要：
深度撞击飞越航天器上的高分辨率仪器红外光谱仪（HRI-IR）在日心距离为2 AU的动态年轻奥尔特云彗星C/2009 P1（Garradd）近日点后的彗发中检测到H2O，CO2和CO。生产率得出的母体挥发物，QH 2 O = 4.6e28，QCO 2 = 3.9e27，和QCO = 2.9e28分子s-1，并与其他观察员所看到的趋势和在一个类似的时间段内获得的测量误差条一致。当编译与其他观测的优势挥发物的Garradd，意想不到的行为被认为是在释放CO。的H2O释气Garradd，增加和峰值前近日点，然后稳步下降，是更典型的比CO，单调增加整个幻影。由于挥发性物质释放的时间不对称性，Garradd在HRI-IR观测期间显示出有史以来在水雪线内观测到的最高CO与H2O丰度比为60%。此外，HRI-IR对CO2进行了唯一的直接测量，给出了典型的彗星CO2与H2O的丰度比为8%，但只有一次测量，没有意义它如何随轨道位置而变化。
英文摘要：
The High Resolution Instrument Infrared Spectrometer (HRI-IR) onboard the Deep Impact Flyby spacecraft detected H2O, CO2, and CO in the coma of the dynamically young Oort cloud comet C/2009 P1 (Garradd) post-perihelion at a heliocentric distance of 2 AU. Production rates were derived for the parent volatiles, QH2O = 4.6e28, QCO2 = 3.9e27, and QCO = 2.9e28 molecules s-1, and are consistent with the trends seen by other observers and within the error bars of measurements acquired during a similar time period. When compiled with other observations of the dominant volatiles of Garradd, unexpected behavior was seen in the release of CO. The H2O outgassing of Garradd, increasing and peaking pre-perihelion and then steadily decreasing, is more typical than that of CO, which monotonically increased throughout the entire apparition. Due to the temporal asymmetry in volatile release, Garradd exhibited the highest CO to H2O abundance ratio ever observed for any comet inside the water snow line at 60 percent during the HRI-IR observations. Also, the HRI-IR made the only direct measurement of CO2, giving a typical cometary abundance ratio of CO2 to H2O of 8 percent but, with only one measurement, no sense of how it varied with orbital position.
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