ASTROBIOLOGICAL POTENTIALS OF BROWN DWARFS

摘要

The astrobiological potential can be outlined as the follows: 1. At certain mass and age intervals water can appear in the atmosphere of BDs in clouds. 2. During the evolution of BDs the optimal atmospheric layer sinks downward into higher pressure environment. 3. The organic matter formation could be problematic even in a late cold phase of BDs. Because of the lack of selective accretion effect the relative abundance of elements. 4. It is a problem for the observations that BDs with higher strobiological potential are the less luminuous. 5. Great improvement of strobilogical knowledge will happen as we get better models and spectroscopic measurements of atmospheres of giant planets and BDs. The chemistry in the atmospheres is the key to the astrobiological potential. 6. Because of the cooling the best periods for astrobiology are late evolutional phases. 7. There could be great differences in the various evolutionary phases according to different masses. 8. The characteristics of BD's astrobiological potentials are strongly different form solid surfaced planets or moons but familiar (mostly in the atmospheric processes) with giant planets.