Image Details
Caption: Fig. 4.
Effect of the sound speed on spiral structure driven by an external planet or bound star. Two simulations, F and L, are shown for times when the planet is at periapse (left panels), at apoapse (right panels), and at an intermediate time (middle panels). The planets have eccentricities ﹩e=0.25﹩ and planet mass ratios ﹩q=5\times 10^{-3}﹩. The simulations shown in the top panels have disk aspect ratios of ﹩h/ r=0.04﹩, and those shown in the bottom panels have ﹩h/ r=0.10﹩. Thicker (or higher sound speed) disks exhibit lower amplitude and a more open spiral structure.
© 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.