Flipping the orbital planes of primordial trans neptunian binaries by close encounters with Neptune during the planetary instability migration phase of the outer solar system

BRUNINI, A.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 vol. 483 p. 5042 - 5044

0035-8711

The distribution of inclinations of the mutual orbits of trans neptunianbinaries carries valuable information about their formation process. Theinclinations measured so far show a clear preference of orbital motion inthe same sense as the orbits around the Sun. This fact strongly favorsbinary formation by gravitational collapse of nebular clumps of small solidparticles. A few binaries, however, are orbiting in retrograde motion,challenging an origin by this mechanism. Here we show that an implantedpopulation of binaries formed by Gravitational Cloud Collapse in directorbits, flipped their orbital planes during close encounters with Neptune.The Cloud Collapse formation mechanism is therefore the most plausibleway to form Trans Neptunian Binaries in the innermost part of the outersolar system, and then implanted in the Kuiper Belt during the planetaryinstability phase.