Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125l..12l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. L12-L15. Research supported by the Technion Israel
Astronomy and Astrophysics
Astrophysics
32
Astronomical Models, Binary Stars, Extrasolar Planets, Planetary Evolution, Protoplanets, Tides, Red Giant Stars, Stellar Envelopes, Stellar Winds
Scientific paper
The evolution of a star-planet system is calculated at a stage in which a planet accretes from a red giant star's wind. Tidal interaction is included. For initial separations larger than a certain critical value, the separation is found to increase, while for smaller initial separations a tidally induced spiralling-in ensues. A second (smaller) critical initial separation is found to exist. For initial separations smaller than this second critical value, the planet manages to penetrate the giant's envelope before the latter is lost via the stellar wind. It is suggested that the spiralling-in process combined with accretion inside the giant's envelope, as calculated by Livio and Soker (1983), can lead to the formation of low-mass cataclysmic binaries.
Livio Mario
Soker Noam
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