复杂有机分子的旅程:原行星盘中的形成和运输

IF 5.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
T. Benest Couzinou, O. Mousis, G. Danger, A. Schneeberger, A. Aguichine, A. Bouquet
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引用次数: 0

摘要

上下文。复杂的有机分子是分子多样性的指标。在彗星、行星和卫星上发现了它们,促使人们对它们的起源,特别是有利于它们形成的条件进行了研究。一种假设认为,紫外线照射原太阳星云中的冰粒会产生显著的分子复杂性,这一假设得到了甲醇冰照射实验的支持。我们研究了甲醇冰粒在原太阳星云中迁移时的辐照。我们的目标是确定所遇到的条件是否有助于复杂有机分子的形成,我们在分析中利用实验数据。我们开发了一个二维模型,描述了在原太阳星云演化过程中鹅卵石的运输,采用拉格朗日方案。该模型计算了粒子沿其路径所接收到的星际紫外线通量,并与实验值进行了比较。在原太阳星云演化25 kyr的时间尺度内,平均而言,在20 K的局部温度下释放的1 ~ 100µm大小的颗粒经过足够的辐照,获得了与甲醇冰相同的分子多样性。相比之下,1cm大小的颗粒需要911 kyr的照射才能达到类似的分子多样性,因此不太可能具有类似的分子复杂性。同样,在80 K的局部温度下释放的1 ~ 100µm大小的颗粒,在141和359 kyr后得到充分的辐照。相比之下,1厘米大小的颗粒需要几百万年才能接受这种水平的辐射,这是不可行的,因为它们在大约500公里内穿过冰线。粒子容易接受必要的照射剂量,以产生实验中观察到的圆盘外部区域内的分子多样性。我们的模型与未来的辐射实验相结合,可以为行星形成的特定区域提供更多的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Journey of complex organic molecules: Formation and transport in protoplanetary disks
Context. Complex organic molecules serve as indicators of molecular diversity. Their detection on comets, planets, and moons has prompted inquiries into their origins, particularly the conditions conducive to their formation. One hypothesis suggests that the UV irradiation of icy grains in the protosolar nebula generates significant molecular complexity, a hypothesis supported by experiments on methanol ice irradiation.Aims. We investigated the irradiation of methanol ice particles as they migrate through the protosolar nebula. Our objective is to ascertain whether the encountered conditions facilitate the formation of complex organics molecules, and we leverage experimental data in our analysis.Methods. We developed a two-dimensional model that describes the transport of pebbles during the evolution of the protosolar nebula, employing a Lagrangian scheme. This model computes the interstellar UV flux received by the particles along their paths, which we compared with experimental values.Results. On average, particles ranging from 1 to 100 µm in size, released at a local temperature of 20 K, undergo adequate irradiation to attain the same molecular diversity as methanol ice during the experiments within timescales of 25 kyr of protosolar nebula evolution. In contrast, 1 cm sized particles require 911 kyr of irradiation to reach similar molecular diversity, making comparable molecular complexity unlikely. Similarly, particles ranging from 1 to 100 µm in size, released at a local temperature of 80 K, receive sufficient irradiation after 141 and 359 kyr. In contrast, 1 cm sized particles would require several million years to receive this level of irradiation, which is infeasible since they cross the iceline within approximately 500 kyr.Conclusions. The particles readily receive the irradiation dose necessary to generate the molecular diversity observed in the experiments within the outer regions of the disk. Our model, combined with future irradiation experiments, can provide additional insights into the specific regions where the building blocks of planets form.
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来源期刊
Astronomy & Astrophysics
Astronomy & Astrophysics 地学天文-天文与天体物理
CiteScore
10.20
自引率
27.70%
发文量
2105
审稿时长
1-2 weeks
期刊介绍: Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.
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