HD 106906: A Case Study for External Perturbations of a Debris Disk
arXiv:1702.06578 · doi:10.3847/2041-8213/aa61a7
Abstract
Models of debris disk morphology are often focused on the effects of a planet orbiting interior to or within the disk. Nonetheless, an exterior planetary-mass perturber can also excite eccentricities in a debris disk, via Laplace-Lagrange secular perturbations in the coplanar case or Kozai-Lidov perturbations for mutually inclined companions and disks. HD 106906 is an ideal example of such a system, as it harbors a confirmed exterior 11 M_Jup companion at a projected separation of 650 au outside a resolved, asymmetric disk. We use collisional and dynamical simulations to investigate the interactions between the disk and the companion, and to use the disk's observed morphology to place constraints on the companion's orbit. We conclude that the disk's observed morphology is consistent with perturbations from the observed exterior companion. Generalizing this result, we suggest that exterior perturbers, as well as interior planets, should be considered when investigating the cause of observed asymmetries in a debris disk.
14 pages, 4 figures, accepted to ApJ Letters
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- Debris Disks in Multi-Planet Systems: Are Our Inferences Compromised by Unseen Planets?
- Millimeter Dust Emission and Planetary Dynamics in the HD 106906 System
- Giant Planets Can Act As Stabilizing Agents on Debris Disks
- Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2