Solar System Analogs Around IRAS-Discovered Debris Disks

Details Solar System Analogs Around IRAS-Discovered Debris Disks Solar System Analogs Around IRAS-Discovered Debris Disks

2009-06-19

arxiv.org/abs/0906.3744v1

Astrophys.J.701:1367-1372,2009

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

8 pages, 2 figures (including 2 color figures), ApJ, in press

Scientific paper

10.1088/0004-637X/701/2/1367

We have rereduced Spitzer IRS spectra and reanalyzed the SED's of three nearby debris disks: lambda Boo, HD 139664, and HR 8799. We find that that the thermal emission from these objects is well modeled using two single temperature black body components. For HR 8799 -- with no silicate emission features despite a relatively hot inner dust component (Tgr = 150 K) -- we infer the presence of an asteroid belt interior to and a Kuiper Belt exterior to the recently discovered orbiting planets. For HD 139664, which has been imaged in scattered light, we infer the presence of strongly forward scattering grains, consistent with porous grains, if the cold, outer disk component generates both the observed scattered light and thermal emission. Finally, careful analysis of the lambda Boo SED suggests that this system possesses a central clearing, indicating that selective accretion of solids onto the central star does not occur from a dusty disk.

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