Fomalhaut's Disk And Planet: Constraining The Mass And Orbit Of Fomalhaut-b Using Disk Morphology"

Details Fomalhaut's Disk And Planet: Constraining The Mass And Orbit Of Fomalhaut-b Using Disk Morphology" Fomalhaut's Disk And Planet: Constraining The Mass And Orbit Of Fomalhaut-b Using Disk Morphology"

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335104c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #351.04; Bulletin of the American Astronomical Society, Vol. 41, p.491

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a numerical model of how Fomalhaut b, the recently imaged exoplanet candidate, shapes Fomalhaut's debris disk. Our model indicates that Fomalhaut b must have a mass less than 3 Jupiter masses. Previous mass constraints based on disk morphology rely on several oversimplifications. We explain why our new constraints on the mass and the orbit of Fomalhaut b are more reliable. They are based on a global model of the disk that is not restricted to the chaotic zone boundary. We screen disk parent bodies, which define Fomalhaut's birth ring, for dynamical stability over the system age. Parent bodies are modelled separately from their dust grain progeny, whose orbits are strongly affected by radiation pressure and whose lifetimes are limited to about 0.1 Myr by destructive grain-grain collisions. Parent bodies are evacuated from mean-motion resonances with Fomalhaut b; these empty resonances are akin to the Kirkwood gaps opened by Jupiter. The belt contains at least 3 Earth masses of solids that are grinding down to dust, their velocity dispersions stirred so strongly by Fomalhaut b that collisions are destructive.

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