http://arxiv.org/abs/1905.11410
We show that the total habitable volume in the atmospheres of cool brown dwarfs with effective temperatures of $\sim 250$-$350$ K is possibly larger by two orders of magnitude than that of Earth-like planets. We also study the role of aerosols, nutrients and photosynthesis in facilitating life in brown dwarf atmospheres. Our predictions might be testable through searches for spectral edges in the near-infrared and chemical disequilibrium in the atmospheres of nearby brown dwarfs that are either free-floating or within $\sim 10$ AU of stars. For the latter category, we find that the James Webb Space Telescope (JWST) may be able to achieve a signal-to-noise ratio of $\sim 5$ after a few hours integration per source for the detection of biogenic spectral features in $\sim 10^3$ cool brown dwarfs.
M. Lingam and A. Loeb
Wed, 29 May 19
10/45
Comments: 17 pages; 3 figures
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