Giantplanet Influence on the Collective Gravity of a Primordial Scattered Disk
Abstract
Axisymmetric disks of higheccentricity, lowmass bodies on nearKeplerian orbits are unstable to an outofplane buckling. This "inclination instability" exponentially grows the orbital inclinations, raises perihelion distances, and clusters in the argument of perihelion. Here we examine the instability in a massive primordial scattered disk including the orbitaveraged gravitational influence of the giant planets. We show that differential apsidal precession induced by the giant planets will suppress the inclination instability unless the primordial mass is ≳20 Earth masses. We also show that the instability should produce a "perihelion gap" at semimajor axes of hundreds of astronomical units, as the orbits of the remnant population are more likely to have extremely large perihelion distances ( ${ \mathcal O }(100\,\mathrm{au})$ ) than intermediate values.
 Publication:

The Astronomical Journal
 Pub Date:
 July 2020
 DOI:
 10.3847/15383881/ab962f
 arXiv:
 arXiv:2004.00037
 Bibcode:
 2020AJ....160...50Z
 Keywords:

 Celestial mechanics;
 Solar system;
 Orbits;
 211;
 1528;
 1184;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 doi:10.3847/15383881/ab962f