A Resolved Millimeter Emission Belt in the AU Mic Debris Disk

Details A Resolved Millimeter Emission Belt in the AU Mic Debris Disk A Resolved Millimeter Emission Belt in the AU Mic Debris Disk

2012-03-08

arxiv.org/abs/1203.1896v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 2 figures. Accepted for publication in ApJ Letters

Scientific paper

We present imaging observations at 1.3 millimeters of the debris disk surrounding the nearby M-type flare star AU Mic with beam size 3 arcsec (30 AU) from the Submillimeter Array. These data reveal a belt of thermal dust emission surrounding the star with the same edge-on geometry as the more extended scattered light disk detected at optical wavelengths. Simple modeling indicates a central radius of ~35 AU for the emission belt. This location is consistent with the reservoir of planetesimals previously invoked to explain the shape of the scattered light surface brightness profile through size-dependent dust dynamics. The identification of this belt further strengthens the kinship between the debris disks around AU Mic and its more massive sister star beta Pic, members of the same ~10 Myr-old moving group.

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