斯皮策探测器对深层撞击喷射物的光谱观测
C M Lisse1, J Vancleve, A C Adams
1Planetary Exploration Group, Space Department, Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA.
Science (New York, N.Y.)
|July 15, 2006
概括
斯皮策太空望远镜分析了彗星9P/Tempel 1的喷射物,揭示了各种材料,如酸盐和碳化合物. 这种组成表明早期太阳星云中的高效混合过程.
科学领域:
- 宇宙尘埃和行星科学 宇宙尘埃和行星科学
- 彗星科学 彗星科学
- 天体化学是天体化学.
背景情况:
- 彗星为早期太阳星云提供了洞察力.
- 深度冲击任务提供了一个独特的机会来研究彗星喷射物.
- 光谱分析揭示了彗星材料的组成.
研究的目的:
- 使用斯皮策太空望远镜数据分析9P/Tempel 1彗星喷射物组成.
- 为了将喷射物组成与其他彗星和环恒星材料进行比较.
- 根据观察到的材料推断早期太阳星云中发生的过程.
主要方法:
- 利用斯皮策太空望远镜的成像光谱仪获取彗星9P/Tempel 1喷射的红外光谱 (5-35微米).
- 分析了排放特征,以识别各种化合物,包括酸盐,碳,碳酸盐,酸盐,多环芳,水和硫化物.
- 将观察到的光谱与彗星C/1995 O1 (海尔波普) 和年轻恒星物体HD100546.6的数据进行了比较.
主要成果:
- 在喷射物中检测到丰富的材料,包括无形和晶体酸盐,无形碳,碳酸盐,酸盐,多环芳,水 (气体和冰) 和硫化物.
- 发现喷射光谱和来自黑尔-波普彗星的物质以及HD100546.6的环恒星环境之间存在很好的一致性.
- 确定的原子丰度与太阳和C1的混晶值一致,尘埃与气体的比率>= 1.3.
结论:
- 在彗星9P/Tempel 1喷射物中观察到的物质混合物表明存在高温和低温相.
- 无形酸盐的高效回火和材料的大规模混合发生在早期的原太阳星云中.
- 彗星的组成是新生太阳系条件和过程的宝贵档案.
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