Habitable Zones & Global Climate

High-Resolution Spectra For A Wide Range of Habitable Zone Planets Around Sun-like Stars

By Keith Cowing
Press Release
July 6, 2020
Filed under
High-Resolution Spectra For A Wide Range of Habitable Zone Planets Around Sun-like Stars
Two oxygen features shown at high-resolution (0.01cm−1 , R > 100, 000) for an exoplanet with an Earth-like albedo with clouds around an F0V, G2V, and K7V host star.

The search for life in the universe is currently focused on Earth-analog planets. However, we should be prepared to find a diversity of terrestrial exoplanets not only in terms of host star but also in terms of surface environment.

Simulated high-resolution spectra of habitable planets covering a wide parameter space are essential in training retrieval tools, optimizing observing strategies, and interpreting upcoming observations. Ground-based extremely large telescopes like ELT, GMT, and TMT; and future space-based mission concepts like Origins, HabEx, and LUVOIR are designed to have the capability of characterizing a variety of potentially habitable worlds. Some of these telescopes will use high precision radial velocity techniques to obtain the required high-resolution spectra (R≈100,000) needed to characterize potentially habitable exoplanets.

Here we present a database of high-resolution (0.01 cm−1) reflection and emission spectra for simulated exoplanets with a wide range of surfaces, receiving similar irradiation as Earth around 12 different host stars from F0 to K7.

Depending on surface type and host star, we show differences in spectral feature strength as well as overall reflectance, emission, and star to planet contrast ratio of terrestrial planets in the Habitable zone of their host stars. Accounting for the wavelength-dependent interaction of the stellar flux and the surface will help identify the best targets for upcoming spectral observations in the visible and infrared.
All of our spectra and model profiles are available online.

Jack Madden, Lisa Kaltenegger
Comments: 9 pages, 5 figures, 1 table. Submitted to ApJL
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2007.02420 [astro-ph.EP] (or arXiv:2007.02420v1 [astro-ph.EP] for this version)
Submission history
From: Jack Madden
[v1] Sun, 5 Jul 2020 18:54:34 UTC (11,872 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻