Effects of neutral ISM gas flow on debris disks: the role of the optical depth

Details Effects of neutral ISM gas flow on debris disks: the role of the optical depth Effects of neutral ISM gas flow on debris disks: the role of the optical depth

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..445m&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.445

Physics

Scientific paper

The motion of dust particles in debris disks can be strongly perturbed by the interactions with the local flux of ISM neutral atoms surrounding the hostWe focus on grains 1-10 μm in radius, larger than blow-out threshold. With a numerical approach we show that for large values of the optical depth the influence of ISM flow on the disk shape is almost negligible: the grains are collisionally destroyed before they can accumulate enough orbital changes due to the ISM flow. However, when the optical depth is small (faint disk) the Keplerian orbits are strongly perturbed, the disk becomes eccentric and peculiar patterns develop in the density distribution. In most cases, due to the large eccentricity excited by the ISM perturbations, a fast inward migration is observed leading to a fast sink mechanism for the disk.

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