彗星81P/野生2的元素组成由星尘收集的样本
George J Flynn1, Pierre Bleuet, Janet Borg
1Department of Physics, State University of New York at Plattsburgh, 101 Broad Street, Plattsburgh, NY 12901, USA. george.flynn@plattsburgh.edu
概括
星尘任务数据显示,彗星81P/Wild 2的粒子在化学上是多样化的. 它们的元素组成与大多数元素的太阳系模型一致,但显示了铜,和的丰富.
科学领域:
- 太空化学 太空化学
- 行星科学 行星科学
- 彗星科学 彗星科学
背景情况:
- 彗星是太阳系早期的残余物,为其组成提供了洞察力.
- 星尘任务收集了81P/Wild 2彗星的样本,以分析其材料.
- 了解彗星的元素组成有助于完善太阳系形成的模型.
研究的目的:
- 为了确定彗星81P/Wild 2尘埃颗粒的元素组成.
- 将彗星物质的组成与现有的太阳系组成模型 (CI石) 进行比较.
- 为了确定彗星样本中任何显著的元素枯竭或丰富.
主要方法:
- 对来自81P/Wild 2彗星的23颗被气凝捕获的粒子和7个石坑残留物的元素组成进行分析.
- 利用了星尘飞船在穿越彗星昏迷时收集的材料.
- 在大约180纳米的尺度上研究化学异质性.
主要成果:
- 彗星粒子表现出化学异质性.
- 平均元素成分与CI石成分相一致,Mg,Si,Mn,Fe,Ni (在35%以内) 和Ca,Ti (在60%以内).
- 与CI石相比,铜 (Cu), (Zn) 和 (Ga) 在野生2材料中被发现是富含的.
结论:
- 来自81P/Wild 2的彗星物质提供了早期太阳系物质的独特样本.
- 观察到的Cu,Zn和Ga的丰富表明,CI石可能无法准确地代表太阳系中这些适度挥发性的小元素的散装成分.
- 需要进一步分析,以完善我们对太阳系中适度挥发性元素的丰富程度的理解.
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