Abstract：
:Terrestrial moons with masses >0.1 M (symbol in text) possibly exist around extrasolar giant planets, and here we consider the energetics of how they might form. Binary-exchange capture can occur if a binary-terrestrial object (BTO) is tidally disrupted during a close encounter with a giant planet and one of the binary members is ejected while the other remains as a moon. Tidal disruption occurs readily in the deep gravity wells of giant planets; however, the large encounter velocities in the wells make binary exchange more difficult than for planets of lesser mass. In addition, successful capture favors massive binaries with large rotational velocities and small component mass ratios. Also, since the interaction tends to leave the captured moons on highly elliptical orbits, permanent capture is only possible around planets with sizable Hill spheres that are well separated from their host stars.
journal_name
Astrobiologyjournal_title
Astrobiologyauthors
Williams DMdoi
10.1089/ast.2012.0892subject
Has Abstractpub_date
2013-04-01 00:00:00pages
315-23issue
4eissn
1531-1074issn
1557-8070journal_volume
13pub_type
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