TY - JOUR

T1 - Spiral Patterns in Planetesimal Circumbinary Disks

AU - Demidova, Tatiana V.

AU - Shevchenko, Ivan I.

PY - 2015/5/20

Y1 - 2015/5/20

N2 - 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.

AB - 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.

KW - planets and satellites: dynamical evolution and stability

KW - planets and satellites: individual (Kepler-16b)

KW - protoplanetary disks

UR - http://www.scopus.com/inward/record.url?scp=84930002801&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/805/1/38

DO - 10.1088/0004-637X/805/1/38

M3 - Article

AN - SCOPUS:84930002801

VL - 805

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 38

ER -