  Due to fortuitous circumstances, the two giant planets around Kepler-419 have
well characterized 3-D orbits. They are nearly coplanar to each other; the
inner one has a large eccentricity (~0.82); and the apses of the two orbits
librate around anti-alignment. Such a state defies available proposals for
large eccentricities. We argue that it is instead uniquely produced by a
decaying protoplanetary disk. When the disk was massive, its precessional
effect on the planets forced the two apses to center around an anti-aligned
state. And as the disk is gradually eroded, the pair of planets are
adiabatically transported to a new state where most of the eccentricity (or
rather, the angular momentum deficit) is transferred to the inner planet, and
the two apses are largely anti-aligned. During this transport, any initial
mutual inclination may be reduced or enhanced; either may be compatible with
the current constraints. So a primordial disk can drive up planet
eccentricities both in resonant planet pairs (as has been shown for GJ 876) and
in secularly interacting, non-resonant pairs. The mechanism discussed here may
be relevant for forming hot Jupiters and for explaining the observed
eccentricities of warm and cold giant planets.
