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arXiv 2202.08252astro-ph.EP
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圆盘和系外行星大气中多环芳烃的观测

Observations of PAHs in the atmospheres of discs and exoplanets

Barbara Ercolano, Christian Rab, Karan Molaverdikhani, Billy Edwards, Thomas Preibisch, Leonardo Testi, Inga Kamp, Wing-Fai Thi

摘要:

多环芳烃(PAHs)在系外行星和行星形成盘的大气化学和流体动力学演化中起着关键作用。如果多环芳烃能在行星形成过程中存活下来,它们很可能参与生物前的化学反应,最终形成更复杂的分子,如氨基酸和核苷酸,这些分子构成了我们所知的生命的基础。然而,由于现有和以前的空间设施的灵敏度和波长范围的限制,这些环境中多环芳烃的丰度和具体作用在很大程度上是未知的。即将进行的红外空间光谱任务,如Twinkle和Ariel,为探测系外行星和行星形成盘大气中的多环芳烃提供了一个独特的机会。在这项工作中,我们提出了综合观测的基础上保守的数值模拟典型的行星形成盘和过境热土星行星围绕太阳型恒星。我们的模型表明,Twinkle和Ariel可能都能够在合理的观测时间内检测到圆盘和过境行星中的3.3微米多环芳烃特征,假设多环芳烃的丰度至少为星际介质值的十分之一。

英文摘要:

Polycyclic aromatic hydrocarbons (PAHs) play a key role in the chemical and hydrodynamical evolution of the atmospheres of exoplanets and planet-forming discs. If they can survive the planet formation process, PAHs are likely to be involved in pre-biotic chemical reactions eventually leading to more complex molecules such as amino acids and nucleotides, which form the basis for life as we know it. However, the abundance and specific role of PAHs in these environments is largely unknown due to limitations in sensitivity and range of wavelength of current and previous space-borne facilities. Upcoming infrared space spectroscopy missions, such as Twinkle and Ariel, present a unique opportunity to detect PAHs in the atmospheres of exoplanets and planet-forming discs. In this work we present synthetic observations based on conservative numerical modeling of typical planet-forming discs and a transiting hot Saturnian planet around solar type star. Our models show that Twinkle and Ariel might both be able to detect the 3.3 micron PAH feature within reasonable observing time in discs and transiting planets, assuming that PAHs are present with an abundance of at least one tenth of the interstellar medium value.

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