Signatures of a Distant Planet on the Inclination Distribution of the Detached Kuiper Belt

Abstract

A distant, massive planet in the outer solar system has recently been proposed to explain some observed features of extreme trans-Neptunian objects (TNOs). Here we use N-body simulations of the formation of the Kuiper belt and Oort cloud as well as a survey simulator to compare models of the solar system with and without a 9th planet to one another as well as to observations. The main mechanism for TNOs to be deposited into the distant ($a$ > au), detached ($q$ > au) region of the Kuiper Belt in the 8-planet model is Kozai-Lidov oscillation of objects in mean motion resonances (MMR) with Neptune. This effect does not deposit low-inclination ($i\lesssim$ 20°) objects into this region. However, we find that the 9th planet generates a group of distant, detached TNOs at low inclinations that are not present in the 8-planet model. This disparity between the 8-planet and the 9-planet models could provide a strong constraint on a possible planet 9 with further detections of TNOs in the distant, detached region of the Kuiper Belt.

8 pages, 3 figures, accepted to ApJL

References in corpus (10)

• The Planet Nine Hypothesis
• Sedna and the Oort Cloud Around a Migrating Sun
• Injection of Oort Cloud Comets: The Fundamental Role of Stellar Perturbations
• Tracking Neptune's Migration History through High-Perihelion Resonant Trans-Neptunian Objects
• Generation of Highly Inclined Trans-Neptunian Objects by Planet Nine
• The orbital distribution of trans-Neptunian objects beyond 50 au
• Dynamical Evolution Induced by Planet Nine
• The 5:1 Neptune Resonance as Probed by CFEPS: Dynamics and Population
• OSSOS XV: Probing the Distant Solar System with Observed Scattering TNOs
• Stability of Neptune's distant resonances in the presence of Planet Nine

Cited by in corpus (1)

• A Non-Primordial Origin for the Widest Binaries in the Kuiper Belt