Circumstellar habitable zones for deep terrestrial biospheres
| Autor: | Jack T. O'Malley-James, John Parnell, Sean McMahon |
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| Rok vydání: | 2013 |
| Předmět: |
Planetary habitability
Kepler-69c Astronomy and Astrophysics Geophysics Habitability of orange dwarf systems Exoplanet Astrobiology Eccentric Jupiter Space and Planetary Science Galactic habitable zone Terrestrial planet Astrophysics::Earth and Planetary Astrophysics Circumstellar habitable zone Geology |
| Zdroj: | Planetary and Space Science. 85:312-318 |
| ISSN: | 0032-0633 |
| DOI: | 10.1016/j.pss.2013.07.002 |
| Popis: | The habitable zone (HZ) is conventionally the thin shell of space around a star within which liquid water is thermally stable on the surface of an Earth-like planet (Kasting et al., 1993). However, life on Earth is not restricted to the surface and includes a “deep biosphere” reaching several km in depth. Similarly, subsurface liquid water maintained by internal planetary heat could potentially support life well outside conventional HZs. We introduce a new term, subsurface-habitability zone (SSHZ) to denote the range of distances from a star within which rocky planets are habitable at any depth below their surfaces up to a stipulated maximum, and show how SSHZs can be estimated from a model relating temperature, depth and orbital distance. We present results for Earth-like, Mars-like and selected extrasolar terrestrial planets, and conclude that SSHZs are several times wider and include many more planets than conventional surface-based habitable zones. |
| Databáze: | OpenAIRE |
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