The orbital decay of a retrograde planet in a protoplanetary disk
- Author(s): Fung, Jeffrey
- Baruteau, Clement
- et al.
Motivated by recent observations of retrograde planets, we investigated the orbital decay of a retrograde planet embedded in a protoplanetary disk. We treated both gravitational and hydrodynamic drag, and found the migration time scale ranges from 103 to 105 years for planet masses between 10-3 to 101 Jupiter masses. We also found that a highly inclined orbit can increase this time scale by a factor of 10 and that due to inclination damping, the final inclination is unlikely to be greater than 50 degrees.