Differentiating Exo-Venus and Exo-Earth Using Transmission Spectroscopy.
In: LPI Contribution, 2021, S. 1-2
academicJournal
Zugriff:
The Transiting Exoplanet Survey Satellite (TESS) is expected to discover a multitude of multi-planetary systems. Of particular interest for comparative planetology are systems with a terrestrial planet in both the Venus Zone and the Habitable Zone. Studying the atmospheres of these planets through transmission spectroscopy will offer a unique opportunity to directly compare the evolutionary differences of two terrestrial planets in the same system. The transmission spectra of Earth and Venus have been shown to be remarkably similar however, which can cause ambiguities when inferring the differences between exo-Earth and exo-Venus climates. In this work, we present a new method of comparing Earth and Venus transmission spectra by conducting a feature-by-feature comparison of four major CO2 absorption bands between 1 and 5 microns. In comparing the transmission spectra, we find that the CO2 feature at 4.3 microns is comparable in absorption size for both exo-Venus and exo-Earth transit spectra, while the smaller CO2 features at 1.7 and 2.0 microns are the best indicators of a CO2-rich atmosphere. We conclude that the CO2 feature at 2.7 microns should be used as a basis for comparison of the amounts of CO2 in exo-Venus and exo-Earth atmospheres, since it most consistently portrays exo-Venus with the more CO2-rich atmosphere. [ABSTRACT FROM AUTHOR]
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Differentiating Exo-Venus and Exo-Earth Using Transmission Spectroscopy.
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Autor/in / Beteiligte Person: | Ostberg, Colby M. ; Dalba, Paul A. ; Kane, Stephen R. |
Zeitschrift: | LPI Contribution, 2021, S. 1-2 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0161-5297 (print) |
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