SOLAR SYSTEM ANALOGS AROUNDIRAS-DISCOVERED DEBRIS DISKS
| Autor: | Joan Najita, Dan M. Watson, Christine Chen, P. Manoj Puravankara, Patrick D. Sheehan |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Solar System Forward scatter FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Debris Accretion (astrophysics) Silicate Spectral line chemistry.chemical_compound chemistry Space and Planetary Science Planet Astrophysics::Solar and Stellar Astrophysics Asteroid belt Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal. 701:1367-1372 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | 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. 8 pages, 2 figures (including 2 color figures), ApJ, in press |
| Databáze: | OpenAIRE |
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