A New Line-By-Line General Circulation Model for Simulations of Diverse Planetary Atmospheres: Initial Validation and Application to the Exoplanet GJ 1132b

Abstract

Exploring diverse planetary atmospheres requires modeling tools that are both accurate and flexible. Here, we develop a three-dimensional general circulation model (3D GCM) that for the first time uses a line-by-line approach to describe the radiative transfer. We validate our GCM by comparing with published results done by different 1D and 3D models. To demonstrate the versatility of the model, we apply the GCM to the hot Earth-sized exoplanet GJ 1132b and study its climate and circulation assuming an atmosphere dominated by abiotic oxygen (O${}_2$). Our simulations show that a minor CO${}_2$ composition can change the circulation pattern substantially, intensifying the equatorial superrotation in particular. Computation of the phase-resolved spectroscopy indicates that the vertical profile of the superrotating jet could be inferred in future spectro-photometric observations by the phase shift of the hotspot in the CO${}_2$ principle absorption band centered at 667 cm${}^{-1}$. We also show that atmospheric mass could potentially be constrained by the phase amplitude in the O${}_2$ vibrational fundamental band for planets with O${}_2$-rich atmospheres, although further experimental and/or theoretical O${}_2$-O${}_2$ collision-induced absorption data at high temperatures is needed to confirm this. More physical schemes such as moist dynamics will be implemented in the GCM in the future so that it can be used to tackle a wide variety of planetary climate problems.

accepted for publication in ApJ

References in corpus (11)

• Global modelling of the early Martian climate under a denser CO2 atmosphere: Water cycle and ice evolution
• Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets
• Inverting Phase Functions to Map Exoplanets
• Atmospheric Circulation of Hot Jupiters: A Shallow Three-Dimensional Model
• Atmospheric Dynamics of Short-period Extra Solar Gas Giant Planets I: Dependence of Night-Side Temperature on Opacity
• The Atmospheric Circulation of the Hot Jupiter WASP-43b: Comparing Three-Dimensional Models to Spectrophotometric Data
• Predictions of the atmospheric composition of GJ 1132b
• Effects of Bulk Composition on The Atmospheric Dynamics on Close-in Exoplanets
• Deciphering thermal phase curves of dry, tidally locked terrestrial planets
• Convection in Condensible-rich Atmospheres
• Dynamics of atmospheres with a non-dilute condensible component

Cited by in corpus (10)

• A coupled model of episodic warming, oxidation and geochemical transitions on early Mars
• Simulating gas giant exoplanet atmospheres with Exo-FMS: Comparing semi-grey, picket fence and correlated-k radiative-transfer schemes
• Extremely long convergence times in a 3D GCM simulation of the sub-Neptune Gliese 1214b
• 3D code for MAgneto-Thermal evolution in Isolated Neutron Stars, MATINS: The Magnetic Field Formalism
• Episodic deluges in simulated hothouse climates
• Stabilization of dayside surface liquid water via tropopause cold trapping on arid slowly rotating tidally locked planets
• 3D code for MAgneto-Thermal evolution in Isolated Neutron Stars, MATINS: thermal evolution and lightcurves
• Prospects for water vapor detection in the atmospheres of temperate and arid rocky exoplanets around M-dwarf stars
• Atmospheric Overturning Circulation on Dry, Tidally-locked Rocky Planets is Mainly Driven by Radiative Cooling
• Lorenz Energy Cycle: Another Way to Understand the Atmospheric Circulation on Tidally Locked Terrestrial Planets