Detectability of Rocky-Vapour atmospheres on super-Earths with Ariel
Detectability of Rocky-Vapour atmospheres on super-Earths with Ariel
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DOI：
10.1007/s10686-020-09693-6
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发表时间：
2021-01
影响因子：
3
通讯作者：
Y. Ito;Q. Changeat;B. Edwards;A. Al-Refaie;G. Tinetti;M. Ikoma
中科院分区：
文献类型：
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作者：
Y. Ito;Q. Changeat;B. Edwards;A. Al-Refaie;G. Tinetti;M. Ikoma
Ariel将标志着一个新时代的到来，它是第一个大规模调查系外行星大气特征的科学目标，旨在解决有关行星组成、演化和形成的基本问题。在这项研究中，我们探索了在离主星很近的轨道上干燥的岩石超级地球上，从岩浆海洋蒸发的大气的可探测性。探测到这样的大气将为岩石行星的存在提供明确的证据，但由于它们的光谱特征很小，目前可用的仪器对测量具有挑战性。然而，一些最热的行星被认为有由蒸发岩石组成的大气层，如Na和SiO，其光谱特征足够明亮，可以通过计划中的太空望远镜进行日食观测。在这项研究中，我们发现，辐射温度为3000 K、距离地球20 pc的岩石超级地球，以及温度高于3500 K、距离地球近50 pc的行星，都具有SiO特征，这些特征在Ariel观测到的日食光谱中可能被探测到。
Ariel will mark the dawn of a new era as the first large-scale survey characterising exoplanetary atmospheres with science objectives to address fundamental questions about planetary composition, evolution and formation. In this study, we explore the detectability of atmospheres vaporised from magma oceans on dry, rocky Super-Earths orbiting very close to their host stars. The detection of such atmospheres would provide a definitive piece of evidence for rocky planets but are challenging measurements with currently available instruments due to their small spectral signatures. However, some of the hottest planets are believed to have atmospheres composed of vaporised rock, such as Na and SiO, with spectral signatures bright enough to be detected through eclipse observations with planned space-based telescopes. In this study, we find that rocky super-Earths with a irradiation temperature of 3000 K and a distance from Earth of up to 20 pc, as well as planets hotter than 3500 K and closer than 50 pc, have SiO features which are potentially detectable in eclipse spectra observed with Ariel.