Star Masses and Star-Planet Distances for Earth-like Habitability
| Autor: | David Waltham |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Initial mass function
Time Factors 010504 meteorology & atmospheric sciences Extraterrestrial Environment Rotation Earth Planet Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Astrobiology Kepler-47 Stars Celestial Planet Natural satellite habitability 0103 physical sciences Exobiology Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Research Articles 0105 earth and related environmental sciences Probability Physics Solar mass Astronomy Agricultural and Biological Sciences (miscellaneous) Habitability of orange dwarf systems Stars Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Solar System Circumstellar habitable zone |
| Zdroj: | Astrobiology |
| ISSN: | 1557-8070 1531-1074 |
| Popis: | This paper presents statistical estimates for the location and duration of habitable zones (HZs) around stars of different mass. The approach is based upon the assumption that Earth's location, and the Sun's mass, should not be highly atypical of inhabited planets. The results support climate-model-based estimates for the location of the Sun's HZ except models giving a present-day outer-edge beyond 1.64 AU. The statistical approach also demonstrates that there is a habitability issue for stars smaller than 0.65 solar masses since, otherwise, Earth would be an extremely atypical inhabited world. It is difficult to remove this anomaly using the assumption that poor habitability of planets orbiting low-mass stars results from unfavorable radiation regimes either before, or after, their stars enter the main sequence. However, the anomaly is well explained if poor habitability results from tidal locking of planets in the HZs of small stars. The expected host-star mass for planets with intelligent life then has a 95% confidence range of 0.78 M⊙ < M |
| Databáze: | OpenAIRE |
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