SURVEY OF NEARBY FGK STARS AT 160 mum WITH SPITZER
- Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 (United States)
- NASA Exoplanet Science Institute, Caltech, 770 S. Wilson Ave., Pasadena, CA 91125 (United States)
- Jet Propulsion Lab, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States)
- Johns Hopkins University-Applied Physics Laboratory, SD/SRE, MP3-W155, 7707 Montpelier Road Laurel, MD 20723 (United States)
- Astronomy Department, Van Vleck Observatory, Wesleyan University, Middletown, CT 06459 (United States)
The Spitzer Space Telescope has advanced debris disk science tremendously with a wealth of information on debris disks around nearby A, F, G, K, and M stars at 24 and 70 mum with the MIPS photometer and at 8-34 mum with IRS. Here we present 160 mum observations of a small subset of these stars. At this wavelength, the stellar photospheric emission is negligible and any detected emission corresponds to cold dust in extended Kuiper Belt analogs. However, the Spitzer 160 mum observations are limited in sensitivity by the large beam size which results in significant 'noise' due to cirrus and extragalactic confusion. In addition, the 160 mum measurements suffer from the added complication of a light leak next to the star's position whose flux is proportional to the near-infrared flux of the star. We are able to remove the contamination from the leak and report 160 mum measurements or upper limits for 24 stars. Three stars (HD 10647, HD 207129, and HD 115617) have excesses at 160 mum that we use to constrain the properties of the debris disks around them. A more detailed model of the spectral energy distribution of HD 10647 reveals that the 70 and 160 mum emission could be due to small water ice particles at a distance of 100 AU, consistent with Hubble Space Telescope optical imaging of circumstellar material in the system.
- OSTI ID:
- 21367460
- Journal Information:
- Astrophysical Journal, Vol. 704, Issue 1; Other Information: DOI: 10.1088/0004-637X/704/1/109; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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