Capture of the Sun's Oort Cloud from Stars in its Birth Cluster

Details Capture of the Sun's Oort Cloud from Stars in its Birth Cluster Capture of the Sun's Oort Cloud from Stars in its Birth Cluster

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0506l&link_type=abstract

American Astronomical Society, DPS meeting #42, #5.06; Bulletin of the American Astronomical Society, Vol. 42, p.950

Biology

Scientific paper

Oort cloud comets are currently believed to have formed in the Sun's proto-planetary disk, and to have been ejected to large heliocentric orbits by the giant planets. Detailed models of this process fail to reproduce all of the available observational constraints, however. In particular, the Oort cloud appears to be significantly more populous than the models predict. Here we present numerical simulations that show that the Oort cloud could have been captured from other stars while the Sun was in its birth cluster. Our results imply that > 90% of the Oort cloud comets that we have seen are from the proto-planetary disks of other stars. This includes some of the most famous comets in history, including 1P/Halley and C/1995 O1 (Hale-Bopp). We thank NASA's Astrobiology Inst, and Origins and OPR programs for support.

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