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Title:
Solar System Analogs Around IRAS-Discovered Debris Disks
Authors:
Chen, Christine H.; Sheehan, Patrick; Watson, Dan M.; Manoj, P.; Najita, Joan R.
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AB(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AC(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AD(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA ), AE(NOAO, 950 North Cherry Avenue, Tucson, AZ 85726, USA)
Publication:
The Astrophysical Journal, Volume 701, Issue 2, pp. 1367-1372 (2009). (ApJ Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
circumstellar matter, planetary systems: formation
DOI:
10.1088/0004-637X/701/2/1367
Bibliographic Code:
2009ApJ...701.1367C

Abstract

We have rereduced Spitzer IRS spectra and reanalyzed the spectral energy distributions (SEDs) of three nearby debris disks: λ Boo, HD 139664, and HR 8799. We find 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 (T gr = 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 λ 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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