Constraining the Planetary System of Fomalhaut Using High-Resolution ALMA Observations

Details Constraining the Planetary System of Fomalhaut Using High-Resolution ALMA Observations Constraining the Planetary System of Fomalhaut Using High-Resolution ALMA Observations

2012-03-30

arxiv.org/abs/1204.0007v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

First ALMA cycle 0 science results. Accepted by ApJL

Scientific paper

The dynamical evolution of planetary systems leaves observable signatures in debris disks. Optical images trace micron-sized grains, which are strongly affected by stellar radiation and need not coincide with their parent body population. Observations of mm-size grains accurately trace parent bodies, but previous images lack the resolution and sensitivity needed to characterize the ring's morphology. Here we present ALMA 350 GHz observations of the Fomalhaut debris ring. These observations demonstrate that the parent body population is 13-19 AU wide with a sharp inner and outer boundary. We discuss three possible origins for the ring, and suggest that debris confined by shepherd planets is the most consistent with the ring's morphology.

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