An inherited complex organic molecule reservoir in a warm planet-hosting disk

An inherited complex organic molecule reservoir in a warm planet-hosting disk
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温暖行星盘中遗传的复杂有机分子库

DOI:
10.1038/s41550-021-01352-w
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发表时间:
2021
期刊:
影响因子:
14.1
通讯作者:
Booth A
Booth A
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Booth A

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量化原行星盘中物质的组成对于确定系外行星系统产生和支持可居住环境的潜力至关重要。当考虑潜在的可居住性时,复杂的有机分子是相关的,其中关键是甲醇(CH3OH)。甲醇主要在低温下通过冰尘颗粒表面上的CO冰的氢化形成,并且是形成更复杂的物质如氨基酸和蛋白质的必要基础。我们报告的检测CH3OH在一个年轻的,明亮的A型星星,HD 100546周围的磁盘。这个圆盘是温暖的,因此没有丰富的CO冰库。我们认为,CH3OH不能形成原位,因此,这个磁盘可能继承了复杂的有机分子丰富的冰从早期的冷暗云阶段。这是一个强有力的证据,表明至少有一些星际有机物质在盘形成过程中幸存下来,然后可以被纳入形成行星,卫星和彗星。因此,关键的前生物化学演化已经发生在黑暗的恒星形成云中。
Quantifying the composition of the material in protoplanetary disks is essential to determining the potential for exoplanetary systems to produce and support habitable environments. When considering potential habitability, complex organic molecules are relevant, key among which is methanol (CH3OH). Methanol primarily forms at low temperatures via the hydrogenation of CO ice on the surface of icy dust grains and is a necessary basis for the formation of more complex species such as amino acids and proteins. We report the detection of CH3OH in a disk around a young, luminous A-type star, HD 100546. This disk is warm and therefore does not host an abundant reservoir of CO ice. We argue that the CH3OH cannot form in situ, and hence that this disk has probably inherited complex-organic-molecule-rich ice from an earlier cold dark cloud phase. This is strong evidence that at least some interstellar organic material survives the disk-formation process and can then be incorporated into forming planets, moons and comets. Therefore, crucial pre-biotic chemical evolution already takes place in dark star-forming clouds.
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