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Extended gaps in the debris disks of both Vega and Fomalhaut have beenobserved. These structures have been attributed to tidal perturbations bymultiple super-Jupiter gas giant planets. Within the current observationallimits, however, no such massive planets have been detected. Here we propose aless stringent `lone-planet' scenario to account for the observed structurewith a single eccentric gas giant and suggest that clearing of these wide gapsis induced by its sweeping secular resonance. During the depletion of the diskgas, the planet's secular resonance propagates inward and clears a wide gapover an extended region of the disk. Although some residual intermediate-sizeplanetesimals may remain in the gap, their surface density is too low to eitherproduce super-Earths or lead to sufficiently frequent disruptive collisions togenerate any observable dusty signatures. The main advantage of thislone-planet sweeping-secular-resonance model over the previous multiple gasgiant tidal truncation scenario is the relaxed requirement on the number of gasgiants. The observationally inferred upper mass limit can also be satisfiedprovided the hypothetical planet has a significant eccentricity. A significantfraction of solar or more massive stars bear gas giant planets with significanteccentricities. If these planets acquired their present-day kinematicproperties prior to the depletion of their natal disks, their sweeping secularresonance would effectively impede the retention of neighboring planets andplanetesimals over a wide range of orbital semi-major axes.

astrophysical journal/the astrophysical journal

Clearing residual planetesimals by sweeping secular resonances in  transitional disks: a lone-planet scenario for the wide gaps in debris disks  around Vega and Fomalhaut