彗星中Cameron带发射的模型：以103 P/Hartley 2彗星为目标的EPOXI任务的例子
Model for Cameron band emission in comets: A case for EPOXI mission target comet 103P/Hartley 2
摘要：
本文利用CO分子的Cameron带（α_3Pi-X_1Sigma）发射，假定CO_2的光解离激发是α_3Pi亚稳态CO的主要产生机制，导出了彗星中CO_2的产生速率。本文建立了一个CO（α_3Pi）的产生和损失模型，并应用于EPOXI任务的目标彗星103 P/Hartley 2。我们的模型计算表明，光电子碰撞激发的CO和解离激发的CO2可以一起贡献约60-90%的卡梅隆带的发射。哈特利2号彗星（0-0）卡梅隆带辐射的亮度模型与哈勃太空望远镜观测结果一致，其中CO2含量为3-5%（取决于模型输入的太阳通量），CO含量为0.5%（相对于水），其中光电子撞击贡献约为50- 75%。我们建议重新考虑使用卡梅隆波段发射的彗星上的CO2丰度的估计。预测了EPOXI任务交会期间~1300 R卡梅隆波段高度积分柱亮度.
英文摘要：
The CO2 production rate has been derived in comets using the Cameron band (a3Pi - X1Sigma) emission of CO molecule assuming that photodissociative excitation of CO2 is the main production mechanism of CO in a3Pi metastable state. We have devoloped a model for the production and loss of CO(a3Pi) which has been applied to comet 103P/Hartley 2: the target of EPOXI mission. Our model calculations show that photoelectron impact excitation of CO and dissociative excitation of CO2 can together contribute about 60-90% to the Cameron band emission. The modeled brightness of (0-0) Cameron band emission on comet Hartley 2 is consistent with Hubble Space Telescope observations for 3-5% CO2 (depending on model input solar flux) and 0.5% CO relative to water, where photoelectron impact contribution is about 50-75%. We suggest that estimation of CO2 abundances on comets using Cameron band emission may be reconsidered. We predict the height integrated column brightness of Cameron band of ~1300 R during EPOXI mission encounter period.
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