Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720205d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #202.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The GASPS Open Time Key Programme for the Herschel Space Observatory represents a new opportunity to survey protoplanetary disks and young debris disks at far-IR wavelengths. We present preliminary PACS 70 and 160 micron photometry of eighteen stars in the 30 Myr-old Tucana-Horologium association. Of these eighteen, six were detected in the 70 micron band. Two were also detected in the 160 micron band. We constructed SEDs for these systems using optical data from Hipparcos (B and V), near-IR data from 2MASS (J, H, and K), mid-IR data from IRAS and Spitzer MIPS (12 and 24 microns, respectively), and the new far-IR data from PACS. For the stars showing IR excess emission, we fit the data using models of optically thin debris disks with realistic dust grain properties. Our SED fitting constrains six disk parameters: the disk mass, grain size distribution, minimum and maximum grain sizes, and the minimum and maximum radial distance of the disk. The best-fit parameters give us a sense of the dust abundance and spatial distribution in these systems.
Dent William
Donaldson Jessica
Roberge Aki
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