A Note on the “Various Atmospheres over Water Oceans on Terrestrial Planets with a One-Dimensional Radiative-Convective Equilibrium Model
It has been investigated the possibility of the various atmospheres over water oceans. We have considered the H2 atmosphere and He atmosphere concerning to N2 atmosphere over oceans.
One of the main subjects in astrobiology is to estimate the habitable zone. If there is an ocean on the planet with an atmosphere, there is an upper limit to the outgoing infrared radiation called the Komabayashi-Ingersoll limit (KI-limit). This limit depends on the components of the atmospheres. We have investigated this dependence under the simple model, using the one-dimensional gray radiative-convective equilibrium model adopted by Nakajima et al. (1992).
The outgoing infrared radiation (FIRout) with the surface temperature (Ts) has shown some peculiar behavior. The examples for H2, He, and N2 background gas for H2O vapour are investigated. There is another limit called the Simpson-Nakajima limit (SN-limit) mainly composed of vapour. This steam limit does not depend on the background atmosphere components. Under super-Earth case (g=2×9.8 m/s2), several cases are also calculated. The KI-limit dependence on the initial pressure is presented. The various emission rates by Koll & Cronin (2019) are investigated.
Tetsuya Hara, Anna Suzuki, Masayoshi Kiguchi, Akika Nakamichi
Comments: 36 pages, 29 figures
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2210.05963 [astro-ph.EP] (or arXiv:2210.05963v1 [astro-ph.EP] for this version)
Submission history
From: Tetsuya Hara
[v1] Wed, 12 Oct 2022 07:03:05 UTC (161 KB)
https://arxiv.org/abs/2210.05963
Astrobiology,
