HERSCHEL PACS OBSERVATIONS AND MODELING OF DEBRIS DISKS IN THE TUCANA-HOROLOGIUM ASSOCIATION

We present Herschel PACS photometry of 17 B- to M-type stars in the 30 Myr old Tucana-Horologium Association. This work is part of the Herschel Open Time Key Programme "Gas in Protoplanetary Systems". 6 of the 17 targets were found to have infrared excesses significantly greater than the e...

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Bibliographic Details
Published in:The Astrophysical journal 2012-07, Vol.753 (2), p.1-12
Main Authors: DONALDSON, J. K, ROBERGE, A, RIVIERE-MARICHALAR, P, SANDELL, G, CHEN, C. H, AUGEREAU, J.-C, DENT, W. R. F, EIROA, C, KRIVOV, A. V, MATHEWS, G. S, MEEUS, G, MENARD, F
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMIC DUST
Debris
DENSITY
Disks
Dust
Earth, ocean, space
Estimates
Exact sciences and technology
GRAIN SIZE
INDEXES
INFRARED RADIATION
INFRARED SPECTRA
MASS
Mathematical models
PHOTOMETRY
PROTOPLANETS
Sciences of the Universe
Space telescopes
STARS
SURFACES
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Summary:We present Herschel PACS photometry of 17 B- to M-type stars in the 30 Myr old Tucana-Horologium Association. This work is part of the Herschel Open Time Key Programme "Gas in Protoplanetary Systems". 6 of the 17 targets were found to have infrared excesses significantly greater than the expected stellar IR fluxes, including a previously unknown disk around HD30051. These six debris disks were fitted with single-temperature blackbody models to estimate the temperatures and abundances of the dust in the systems. For the five stars that show excess emission in the Herschel PACS photometry and also have Spitzer IRS spectra, we fit the data with models of optically thin debris disks with realistic grain properties in order to better estimate the disk parameters. The model is determined by a set of six parameters: surface density index, grain size distribution index, minimum and maximum grain sizes, and the inner and outer radii of the disk. The best-fitting parameters give us constraints on the geometry of the dust in these systems, as well as lower limits to the total dust masses. The HD105 disk was further constrained by fitting marginally resolved PACS 70 mu m imaging.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/753/2/147