elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Evolution and Spectral Response of a Steam Atmosphere for Early Earth with a Coupled Climate Interior Model

Katyal, N. and Nikolaou, A. and Godolt, M. and Grenfell, J. L. and Tosi, N. and Schreier, F. and Rauer, H. (2019) Evolution and Spectral Response of a Steam Atmosphere for Early Earth with a Coupled Climate Interior Model. The Astrophysical Journal, 875 (1), pp. 1-18. American Astronomical Society. DOI: 10.3847/1538-4357/ab0d85 ISSN 0004-637X

[img] PDF - Postprint version (accepted manuscript)
2MB

Official URL: http://dx.doi.org/10.3847/1538-4357/ab0d85

Abstract

The evolution of Earth's early atmosphere and the emergence of habitable conditions on our planet are intricately coupled with the development and duration of the magma ocean (MO) phase during the early Hadean period (4–4.5 Ga). In this paper, we study the evolution of the steam atmosphere during the MO period. We obtain the outgoing longwave radiation (OLR) using the line-by-line radiative transfer code GARLIC. Our study suggests that an atmosphere consisting of pure H2O, built as a result of outgassing, extends the MO lifetime to several million years. The thermal emission as a function of the solidification timescale of an MO is shown. We study the effect of thermal dissociation of H2O at higher temperatures by applying atmospheric chemical equilibrium, which results in the formation of H2 and O2 during the early phase of the MO. A 1%–6% reduction in the OLR is seen. We also obtain the effective height of the atmosphere by calculating the transmission spectra for the whole duration of the MO. An atmosphere of depth 100 km is seen for pure water atmospheres. The effect of thermal dissociation on the effective height of the atmosphere is also shown. Due to the difference in the absorption behavior at different altitudes, the spectral features of H2 and O2 are seen at different altitudes of the atmosphere. Therefore, these species, along with H2O, have a significant contribution to the transmission spectra and could be useful for placing observational constraints on MO exoplanets.

Item URL in elib:https://elib.dlr.de/127613/
Document Type:Article
Title:Evolution and Spectral Response of a Steam Atmosphere for Early Earth with a Coupled Climate Interior Model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Katyal, N.nisha.katyal (at) dlr.deUNSPECIFIED
Nikolaou, A.athanasia.nikolaou (at) dlr.deUNSPECIFIED
Godolt, M.mareike.godolt (at) dlr.deUNSPECIFIED
Grenfell, J. L.lee.grenfell (at) dlr.deUNSPECIFIED
Tosi, N.nicola.tosi (at) dlr.deUNSPECIFIED
Schreier, F.franz.schreier (at) dlr.deUNSPECIFIED
Rauer, H.heike.rauer (at) dlr.deUNSPECIFIED
Date:2019
Journal or Publication Title:The Astrophysical Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:875
DOI :10.3847/1538-4357/ab0d85
Page Range:pp. 1-18
Publisher:American Astronomical Society
ISSN:0004-637X
Status:Published
Keywords:planets and satellites: atmospheres, planets and satellites: interiors, radiative transfer
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Planetary Evolution and Life
Location: Berlin-Adlershof , Oberpfaffenhofen
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Planetary Physics
Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Grenfell, John Lee
Deposited On:14 Jun 2019 09:24
Last Modified:06 Sep 2019 15:30

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.