PDS 70盘的陆地行星形成区的水
G Perotti1, V Christiaens2, Th Henning3
1Max Planck Institute for Astronomy, Heidelberg, Germany. perotti@mpia.de.
Nature
|July 24, 2023
概括
通过JWST的观测,在PDS 70系统的内部盘中检测到了水. 这一发现表明那里形成的陆地行星可以接触到水,可能在现场形成.
科学领域:
- 星球科学
- 天体物理学
- 天体化学
背景情况:
- 陆地行星和海王星以下行星在内部原行星盘 (<10 AU) 中形成.
- 水在行星形成中的作用至关重要,但它的起源 (在现场与运输) 是有争议的.
- 之前的观测 (斯皮策) 仅为内部盘中的水提供了上限.
研究的目的:
- 使用JWST在PDS 70系统的内部盘中寻找水.
- 调查内盘中的陆地行星形成的起源和水的存在.
- 了解影响水存在的化学过程和磁盘动态.
主要方法:
- 利用詹姆斯·韦伯太空望远镜 (JWST) 对 PDS 70 原行星盘的观测.
- 分析了中红外光谱能量分布以检测分子物种.
- 测量水蒸气柱密度和观察到的二氧化碳排放.
主要成果:
- 在PDS70的内部盘中确认存在水.
- 水柱密度表明通过O,H2和/或OH反应在现场形成,能够在自我屏蔽中生存.
- 观察到的二氧化碳排放支持现场形成和紫外线光分离阻力;变量SED表示变化的内盘几何.
结论:
- 在PDS 70内部的行星形成有水库.
- 在现场形成水,可能有助于防尘和外盘补充.
- 这种可变的光谱能量分布表明内盘的几何变化.
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