快速的加热速度决定了 (3200) Phaethon 的挥发性排放和规石组成
Martin D Suttle1,2, Lorenz F Olbrich3, Charlotte L Bays4,5
1School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, UK. martin.suttle@open.ac.uk.
Nature communications
|August 21, 2024
概括
小行星法伊顿 (Phaethon) 是一个小行星.
科学领域:
- 行星科学 行星科学
- 太空化学 太空化学
- 小行星研究研究.
背景情况:
- 小行星 (3200) Phaethon 由于太阳在近日点 (0.14 AU) 的极端升温 (~750°C) 而表现出类似彗星的活动.
- 了解法的规质组成和挥发性排放机制对于解释JAXA的DESTINY+任务数据和小行星研究至关重要.
研究的目的:
- 在模拟的极端太阳能加热条件下,研究小行星 (3200) Phaethon上挥发性排放和 regolith改变的机制.
- 为了确定法伊的 regolith 的组成,并解释其观察到的彗星类活动.
主要方法:
- 通过将CM地铁碎片置于快速,开放系统,循环加热 (2-20°C/分钟) 的方法,对Phaethon的表面条件进行实验模拟.
- 在热处理过程中分析矿物反应和气体释放,以了解挥发性保留和排放.
主要成果:
- 快速的加热速度和低的 regolith 透性促进挥发性气体和分解矿物之间的反应.
- 含硫的气体保留抑制了硫化铁的热分解,使它们能够在重复的加热周期中存活下来.
- 含硫气体的缓慢释放提供了反复释放气体的机制,解释了法的持续活动.
结论:
- 费顿的彗星类活动可以在没有表面更新的情况下发生,由热处理材料的重复释放气体驱动.
- 据预测,法的 regolith 由橄,硫化铁,硫酸和血组成.
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