Structure in the Dusty Debris around Vega

Details Structure in the Dusty Debris around Vega Structure in the Dusty Debris around Vega

2002-03-17

arxiv.org/abs/astro-ph/0203264v2

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted by ApJL

Scientific paper

10.1086/340691

We present images of the Vega system obtained with the IRAM Plateau de Bure interferometer at 1.3 millimeters wavelength with sub-mJy sensitivity and $\sim2\farcs5$ resolution (about 20 AU). These observations clearly detect the stellar photosphere and two dust emission peaks offset from the star by $9\farcs5$ and $8\farcs0$ to the northeast and southwest, respectively. These offset emission peaks are consistent with the barely resolved structure visible in previous submillimeter images, and they account for a large fraction of the dust emission. The presence of two dust concentrations at the observed locations is plausibly explained by the dynamical influence of an unseen planet of a few Jupiter masses in a highly eccentric orbit that traps dust in principle mean motion resonances.

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