Constraints on Planetary Embryos in Thin Debris Disks

Details Constraints on Planetary Embryos in Thin Debris Disks Constraints on Planetary Embryos in Thin Debris Disks

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.0407q&link_type=abstract

American Astronomical Society, DDA meeting #38, #4.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We consider constraints on the planetesimal population residing in the disks of AU Microscopii, Beta Pictoris and Fomalhaut taking into account their observed thicknesses. We estimate that bodies of radius a few to 100 km and with surface densities of order 0.01 g cm-2 are responsible for initiating the collisional cascade accounting for the dust production. Larger bodies, of radius 1000km and with similar surface density are required to explain the thickness of these disks assuming that they are heated by gravitational stirring. A comparison between the two densities suggests the size distribution in the largest bodies is flatter than that observed in the Kuiper belt. Only Fomalhaut's thickness is consistent with stirring by the bodies initiating the collisional cascade. AU Mic requires a shallower size distribution than beta-Pic's suggesting that planetary embryos are growing.

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