Predictions For A Planet Just Inside Fomalhaut's Eccentric Ring

Details Predictions For A Planet Just Inside Fomalhaut's Eccentric Ring Predictions For A Planet Just Inside Fomalhaut's Eccentric Ring

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dda....37.1003q&link_type=abstract

American Astronomical Society, DDA meeting #37, #10.03; Bulletin of the American Astronomical Society, Vol. 38, p.672

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose that the eccentricity and sharpness of the edge of Fomalhaut's disk are due to a planet just interior to the ring edge. The collision timescale consistent with the disk opacity is long enough that spiral density waves cannot be driven near the planet. The ring edge is likely to be located at the boundary of a chaotic zone in the corotation region of the planet. We find that this zone can open a gap in a particle disk as long as the collision timescale exceeds the removal or ejection timescale in the zone. The ring edge has eccentricity caused by secular perturbations from the planet. These arguments imply that the planet has a mass between that of Neptune and that of Saturn, a semi-major axis of approximately 119 AU and longitude of periastron and eccentricity, 0.1, the same as that of the ring edge.

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