标题： 彗星卡梅伦带发射的模型：EPOXI任务目标彗星103P/哈特利2号的案例 显示英文标题

标题： Model for Cameron band emission in comets: A case for EPOXI mission target comet 103P/Hartley 2

摘要： 二氧化碳的生成速率是通过假设光解离激发CO2是产生a3Pi亚稳态CO的主要机制，利用CO分子的卡梅伦带（a3Pi - X1Sigma）发射来推导的。我们开发了一个关于CO(a3Pi)生成和损失的模型，并将其应用于EPOXI任务的目标彗星103P/Hartley 2。我们的模型计算显示，CO的光电子碰撞激发和CO2的解离激发可以共同贡献约60-90%的卡梅伦带发射。在哈特利2号彗星上，(0-0)卡梅伦带发射的模拟亮度与哈勃空间望远镜观测结果一致，对于3-5%的CO2（取决于模型输入的太阳通量）和相对于水的0.5% CO，其中光电子碰撞贡献约为50-75%。我们认为，使用卡梅伦带发射来估算彗星中的CO2丰度可能需要重新考虑。我们预测在EPOXI任务相遇期间，卡梅伦带的高度积分柱亮度约为1300 R。 显示英文摘要

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.