A Mixed Stirring Mechanism for Debris Discs with Giant and Dwarf Planetary Perturbations

Abstract

Debris discs consist of belts of bodies ranging in size from dust grains to planetesimals; these belts are visible markers of planetary systems around other stars that can reveal the influence of extrasolar planets through their shape and structure. Two key stirring mechanisms -- self-stirring by planetesimals and secular perturbation by an external giant planet -- have been identified to explain the dynamics of planetesimal belts; their relative importance has been studied independently, but are yet to be considered in combination. In this work we perform a suite of 286 N-body simulations exploring the evolution of debris discs over 1~Gyr, combining the gravitational perturbations of both dwarf planets embedded in the discs, and an interior giant planet. Our systems were somewhat modeled after the architecture of the outer Solar system: a Solar mass star, a single massive giant planet at 30~au ($M_{\mathrm{GP}}=$ 10 to 316~${\mathrm{M}}_{\oplus }$), and a debris disc formed by 100 massive dwarf planets and 1000 massless particles ($M_{\mathrm{DD}}=$ 3.16 to 31.6~${\mathrm{M}}_{\oplus }$). We present the evolution of both the disc and the giant planet after 1~Gyr. The time evolution of the average eccentricity and inclination of the disc is strongly dependent on the giant planet mass as well as on the remaining disc mass. We also found that efficient stirring is achieved even with small disc masses. In general, we find that a mixed mechanism is more efficient in the stirring of cold debris discs than either mechanism acting in isolation.

arXiv commentAccepted for publication in MNRAS. 11 pages, 6 figures (4 animated). Animated figures can be found at https://figshare.com/projects/Mixed_Stirring_of_Debris_Discs/136118

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• The vertical structure of debris discs and the role of disc gravity: A primer using a simplified model
• Discovery of carbon monoxide emission from five debris disks around young A-type stars
• Testing the Impact of Planet-stirring, Self-stirring, and Mixed-stirring on Debris Disc Architecture: A Case Study of HD 16743
• The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk