Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....65..421h&link_type=abstract
Astronomy and Astrophysics, vol. 65, no. 3, May 1978, p. 421-426.
Astronomy and Astrophysics
Astrophysics
35
Binary Stars, Interstellar Matter, Planetary Evolution, Companion Stars, Long Term Effects, Natural Satellites, Solar System, Stellar Mass, Variable Stars
Scientific paper
On the assumption that planets form by accretion of Goldreich-Ward planetesimals, this paper presents a theory for the existence of regions wherein planets may grow in binary star systems. The numerical results are insensitive to assumed model parameters, particularly with respect to nebular density. The criterion for growth by accretion is that planetesimal collision velocities do not exceed a critical value, under the joint influences of nebular drag and of companion-star secular perturbations. It is found that even large binary semimajor axes (about 50 AU) do not ordinarily permit planet growth. Planet growth appears possible only when the companion is very small or its orbit nearly circular, as in the binary system Sun-Jupiter; but even in this case, effects due to a solar nebula appear required for growth to proceed.
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