Gas in debris disks: a new way to produce patterns?
Wladimir Lyra (JPL/Caltech) - April 14, 2014 at 12:10 pm
Debris disks around young stars (analogues of the Kuiper Belt
in our Solar System) show a variety of non-trivial structures attributed
to planetary perturbations and used to constrain the properties of the
planets. However, these analyses have largely ignored the fact that some
debris disks are found to contain small quantities of gas, a component
that all such disks should contain at some level. Several debris disks
have been measured with a dust-to-gas ratio around unity at which the
effect of hydrodynamics on the structure of the disk cannot be ignored. In
this talk I will present linear and nonlinear modelling that shows that
dust-gas interactions can produce some of the key patterns attributed to
planets. We find a robust photoelectric instability that organizes the
dust into narrow, eccentric rings, similar to the Fomalhaut debris disk.
The conclusion that such disks contain planets is not necessarily required
to explain these systems.
The seminar will be held in B-1 Hearst Field Annex.
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