SIMBAD references

2020MNRAS.491.2845L - Mon. Not. R. Astron. Soc., 491, 2845-2854 (2020/January-2)

High-resolution reflection spectra for Proxima b and Trappist-1e models for ELT observations.


Abstract (from CDS):

The closest stars that harbour potentially habitable planets are cool M stars. Upcoming ground- and space-based telescopes will be able to search the atmosphere of such planets for a range of chemicals. To facilitate this search and to inform upcoming observations, we model the high-resolution reflection spectra of two of the closest potentially habitable exoplanets for a range of terrestrial atmospheres and surface pressures for active and inactive phases of their host stars for both oxic and anoxic conditions: Proxima b, the closest potentially habitable exoplanet, and Trappist-1e, one of the three Earth-sized planets orbiting in the habitable zone of Trappist-1. We find that atmospheric spectral features, including biosignatures like O2 in combination with a reduced gas like CH4 for oxic atmospheres, as well as climate indicators like CO2 and H2O for all atmospheres, show absorption features in the spectra of Proxima b and Trappist-1e models. However, for some features like oxygen, high-resolution observations will be critical to identify them in a planet's reflected flux. Thus, these two planets will be among the best targets for upcoming observations of potential Earth-like planets in reflected light with planned extremely large telescopes.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiative transfer - planets and satellites: atmospheres - planets and satellites: terrestrial planets - stars: low-mass

Simbad objects: 5

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