6 papers
Ring Formation in Protoplanetary Disks Driven by an Eccentric Instability
Jiaru Li, Adam M. Dempsey, Hui Li +1
We find that, under certain conditions, protoplanetary disks may spontaneously generate multiple, concentric gas rings without an embedded planet through an eccentric cooling insta…
Inner Boundary Condition in Quasi-Lagrangian Simulations of Accretion Disks
Adam M. Dempsey, Diego Muñoz, Yoram Lithwick
In simulations of viscously evolving accretion disks, the inner boundary condition is particularly important. If treated incorrectly, it induces incorrect behavior very quickly, be…
Pileups and Migration Rates for Planets in Low Mass Disks
Adam M. Dempsey, Wing-Kit Lee, Yoram Lithwick
We investigate how planets interact with viscous accretion disks, in the limit that the disk is sufficiently low mass that the planet migrates more slowly than the disk material. I…
Long-Lived Eccentricities in Accretion Disks
Wing-Kit Lee, Adam M. Dempsey, Yoram Lithwick
Accretion disks can be eccentric: they support modes that are global and slowly precessing. But whether the modes remain trapped in the disk---and hence are long-lived---depe…
Eccentric Modes in Disks With Pressure and Self-Gravity
Wing-Kit Lee, Adam M. Dempsey, Yoram Lithwick
Accretion disks around stars, or other central massive bodies, can support long-lived, slowly precessing disturbances in which the fluid motion is nearly Keplerian with non-z…
Forming Gliese 876 Through Smooth Disk Migration
Adam M. Dempsey, Benjamin E. Nelson
We run a suite of dissipative N-body simulations to determine which regions of phase space for smooth disk migration are consistent with the GJ876 system, an M-dwarf hosting three…