Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.212...33s&link_type=abstract
Astrophysics and Space Science, vol. 212, nos. 1-2, p. 33-41
Astronomy and Astrophysics
Astrophysics
Atmospheric Composition, Dust, Planetary Atmospheres, Planetary Evolution, Solar System Evolution, Surface Temperature, Transport Properties
Scientific paper
When planetary accretion proceeds in the gas disk-solar nebula, a protoplanet attracts surrounding gas to form a distended H2-He atmosphere. The blanketing effect of the atmosphere, hampering the escape of accretional energy, enhances the surface temperature of planets. Furthermore, evaporation of ice or reduction of surface silicate and metallic oxide can supply a huge amount of water vapor into the atmosphere, which would raise the temperature and promote evaporation. Evaporated materials can be efficiently conveyed outward by vigorous convection, and condensed dust-particles should keep the atmosphere opaque during accretion. The size of this opaque atmosphere 'dust blob' is defined by the gravitiational radius, which exceeds 3 X 108 m when the planetary mass is the Earth's mass (5.97 X 1024 kg). This larger than the radii of present Jovian planets and so-called brown dwarfs. The expected lifetime of 'dust blobs' is 106 to 107 yr, which is longer than that of the later gas accreting and cooling stages of Jovian planets. The number of 'dust blobs' could exceed that of Jovian planets. If the gas disk is rather transparent, the possibility of observing such objects with a distended atmosphere may be higher than that of detecting Jovian planets. Contamination of the gas disk by the dust from primary atmospheres is negligible.
No associations
LandOfFree
Dust blobs in the solar nebula--Primary distended atmosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dust blobs in the solar nebula--Primary distended atmosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dust blobs in the solar nebula--Primary distended atmosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1013724