2015ApJ...805...38D -
Astrophys. J., 805, 38 (2015/May-3)
Spiral patterns in planetesimal circumbinary disks.
DEMIDOVA T.V. and SHEVCHENKO I.I.
Abstract (from CDS):
Planet formation scenarios and the observed planetary dynamics in binaries pose a number of theoretical challenges, especially concerning circumbinary planetary systems. We explore the dynamical stirring of a planetesimal circumbinary disk in the epoch when the gas component disappears. For this purpose, following theoretical approaches by Heppenheimer and Moriwaki & Nakagawa, we develop a secular theory of the dynamics of planetesimals in circumbinary disks. If a binary is eccentric and its components have unequal masses, a spiral density wave is generated, engulfing the disk on a secular timescale, which may exceed 107 yr, depending on the problem parameters. The spiral pattern is transient; thus, its observed presence may betray a system's young age. We explore the pattern both analytically and in numerical experiments. The derived analytical spiral is a modified lituus; it matches the numerical density wave in the gas-free case perfectly. Using the smoothed particle hydrodynamics scheme, we explore the effect of residual gas on the wave propagation.
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Journal keyword(s):
planets and satellites: dynamical evolution and stability - planets and satellites: individual: Kepler-16b - protoplanetary disks
Simbad objects:
5
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