Predictions for a planet just inside Fomalhaut's eccentric ring
TLDR
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
Citations
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Evolution of Debris Disks
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Optical Images of an Exosolar Planet 25 Light-Years from Earth
Paul Kalas,James R. Graham,Eugene Chiang,Michael P. Fitzgerald,Mark Clampin,Edwin S. Kite,Karl R. Stapelfeldt,Christian Marois,John Krist +8 more
TL;DR: Optical observations of an exoplanet candidate, Fomalhaut b, show that the planet's mass is at most three times that of Jupiter; a higher mass would lead to gravitational disruption of the belt, matching predictions of its location.
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Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 M☉ Main-Sequence Stars
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References
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Slow modes in Keplerian disks
TL;DR: In this article, the authors investigate the properties of slow modes, using softened self-gravity as a simple model for collective effects in the disk, and find that all slow modes are stable.
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Apse alignment of narrow eccentric planetary rings
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TL;DR: In this article, a balance of forces due to ring self-gravity, planetary oblateness, and interparticle collisions was proposed to maintain rigid precession of the Uranian rings.
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Image of Fomalhaut Dust Ring at 350 Microns: The Relative Column Density Map Shows Pericenter-Apocenter Asymmetry
TL;DR: In this article, the authors used the HiRes deconvolution procedure to estimate the two-dimensional spatial variation of relative column density ("tau map") using the DISKFIT procedure, which is based on the following physical assumptions: the wavelength variation of opacity is the same throughout the disk, the radial variation of dust temperature is dictated by the energy balance of individual grains in the stellar radiation field, and the vertical scale height of the disk follows a power-law radial variation.
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Light Dark Matter
Michel Casse,Pierre Fayet +1 more
TL;DR: In this article, the SPI spectrometer aboard of the INTEGRAL satellite has released a map of the e+e− annihilation emission line of the Milky Way, showing that most of the photons arise from a region coinciding with the stellar bulge.
Journal ArticleDOI
Image of Fomalhaut Dust Ring at 350 Microns: Relative Column Density Map Shows Pericenter-Apocenter Asymmetry
TL;DR: In this article, the authors used the HiRes deconvolution procedure to estimate the 2-dimensional spatial variation of relative column density (tau map) using the DISKFIT procedure, which is based on the assumption that the wavelength variation of opacity is the same throughout the disk, and the radial variation of dust temperature is dictated by the energy balance of individual grains in the stellar radiation field.