Surface pressure impact on nitrogen-dominated USP super-Earth atmospheres
arXiv:2304.08690 · doi:10.1093/mnras/stad1034
Abstract
In this paper, we compare the chemistry and the emission spectra of nitrogen-dominated cool, warm, and hot ultra-short-period (USP) super-Earth atmospheres in and out of chemical equilibrium at various surface pressure scenarios ranging from 0.1 to 10 bar. We link the one-dimensional VULCAN chemical kinetic code, in which thermochemical kinetic and vertical transport and photochemistry are taken into account, to the one-dimensional radiative transfer model, PETITRADTRANS, to predict the emission spectra of these planets. The radiative-convective temperature-pressure profiles were computed with the HELIOS code. Then, using PANDEXO noise simulator, we explore the observability of the differences produced by disequilibrium processes with the JWST. Our grids show how different surface pressures can significantly affect the temperature profiles, the atmospheric abundances, and consequently the emission spectra of these planets. We find that the divergences due to disequilibrium processes would be possible to observe in cooler planets by targeting HCN, C2H4, and CO, and in warmer planets by targeting CH4 with HCN, using the NIRSpec and MIRI LRS JWST instruments. These species are also found to be sensitive indicators of the existence of surfaces on nitrogen-dominated USP super-Earths, providing information regarding the thickness of these atmospheres.
12 pages
References in corpus (20)
- The Transiting Exoplanet Survey Satellite
- petitRADTRANS: a Python radiative transfer package for exoplanet characterization and retrieval
- KEPLER's First Rocky Planet: Kepler-10b
- Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
- Five Planets Orbiting 55 Cancri
- A chemical model for the atmosphere of hot Jupiters
- A Study of the Shortest-Period Planets Found With Kepler
- VULCAN: an Open-Source, Validated Chemical Kinetics Python Code for Exoplanetary Atmospheres
- Chemistry of Silicate Atmospheres of Evaporating Super-Earths
- The Effects of Consistent Chemical Kinetics Calculations on the Pressure-Temperature Profiles and Emission Spectra of Hot Jupiters
- Exploring Biases of Atmospheric Retrievals in Simulated JWST Transmission Spectra of Hot Jupiters
- Optical Albedo Theory of Strongly-Irradiated Giant Planets: The Case of HD 209458b
- Linking the Climate and Thermal Phase Curve of 55 Cancri e
- A Case for an Atmosphere on Super-Earth 55 Cancri e
- GJ 1252b: A Hot Terrestrial Super-Earth With No Atmosphere
- The discovery and mass measurement of a new ultra-short-period planet: EPIC~228732031b
- GJ 1252 b: A 1.2 planet transiting an M3-dwarf at 20.4 pc
- The Detectability of Rocky Planet Surface and Atmosphere Composition with JWST: The Case of LHS 3844b
- Stellar impact on disequilibrium chemistry and on observed spectra of hot Jupiter atmospheres
- Properties of Sub-Neptune Atmospheres: TOI-270 System