Minimum planetary size for forming outer Jovian-type planets - Stability of an isothermal atmosphere surrounding a protoplanet

Details Minimum planetary size for forming outer Jovian-type planets - Stability of an isothermal atmosphere surrounding a protoplanet Minimum planetary size for forming outer Jovian-type planets - Stability of an isothermal atmosphere surrounding a protoplanet

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215..177s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 177-180.

Astronomy and Astrophysics

Astrophysics

11

Gas Giant Planets, Planetary Atmospheres, Planetary Evolution, Protoplanets, Gas Density, Planetary Cores, Planetary Mass, Solar Corona, Solar System, Planets, Size, Formation, Planetesimals, Atmosphere, Giant Planets, Core, Gases, Capture, Mass, Uranus, Neptune, Theoretical Studies, Parameters, Accretion, Calculations, Models, Numerical Methods

Scientific paper

An initial phase in the formation of Jovian planets is a bound hydrostatic atmosphere. When the core mass reaches a critical value, this atmosphere collapses on to the core, and subsequent rapid gas accumulation should form the present massive gas envelope. In the present study, the critical core mass for gas capture is obtained for an isothermal gas. The critical value is proportional to T exp 1.5 whereas its dependence on ambient gas density is very small. The minimum core mass of Jovian planets is reduced to less than 0.2 times the present mass of the earth. The results suggest that Uranus and Neptune might form initially from small gaseous protoplanets.

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