Predictions for a planet just inside Fomalhaut's eccentric ring
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In this paper, the eccentricity and sharpness of the edge of Fomalhaut's disk are due to a planet just interior to the ring edge, which is likely to be located at the boundary of a chaotic zone in the corotation region of the planet.Abstract:
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. We use the slope measured from the ring edge surface brightness profile to place an upper limit on the planet mass. The removal timescale in the chaotic zone is used to estimate a lower limit. 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.read more
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References
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Journal ArticleDOI
Submillimeter Observations of an Asymmetric Dust Disk around Fomalhaut
Wayne S. Holland,Jane S. Greaves,William R. F. Dent,Mark C. Wyatt,Ben Zuckerman,R. A. Webb,Chris McCarthy,I. M. Coulson,E. I. Robson,Walter Kieran Gear +9 more
TL;DR: In this paper, the cold dust emission around the nearby main-sequence star Fomalhaut was observed at a wavelength of 450 meters, where the telescope beam size is equivalent to a resolution of 50 AU.
Journal ArticleDOI
Resonance Overlap Is Responsible for Ejecting Planets in Binary Systems
Lawrence Mudryk,Yanqin Wu +1 more
TL;DR: In this article, it was shown that the Hill criterion yields an instability boundary that is very similar to that obtained by resonance overlap arguments, making the former both a necessary and a sufficient condition for planet instability.
Journal ArticleDOI
Ages of A-Type Vega-like Stars from uvbyβ Photometry
TL;DR: In this article, the ages of a sample of A-type Vega-like stars were estimated by using Stromgren uvbyβ photometric data and theoretical evolutionary tracks, and it was shown that the fractional IR luminosity decreases with the ages.
Journal ArticleDOI
Ages of A-type Vega-like stars from uvby$\beta$ Photometry
TL;DR: In this paper, the ages of a sample of A-type Vega-like stars were estimated by using Stromgren \emph{uvby$\beta} photometric data and theoretical evolutionary tracks.