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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448081.0, MPI für Astronomie / Publikationen_mpia
Formation and evolution of planetary systems: properties of debris dust around solar-type stars
Authors:Carpenter, John M.; Bouwman, Jeroen; Mamajek, Eric E.; Meyer, Michael R.; Hillenbrand, Lynne A.; Backman, Dana E.; Henning, Thomas; Hines, Dean C.; Hollenbach, David; Kim, Jinyoung Serena; Moro-Martin, Amaya; Pascucci, Ilaria; Silverstone, Murray D.; Stauffer, John R.; Wolf, Sebastian
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal Supplement Series
Start Page:197
End Page:226
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present Spitzer photometric (IRAC and MIPS) and spectroscopic (IRS low resolution) observations for 314 stars in the Formation and Evolution of Planetary Systems Legacy program. These data are used to investigate the properties and evolution of circumstellar dust around solar-type stars spanning ages from approximately 3 Myr-3 Gyr. We identify 46 sources that exhibit excess infrared emission above the stellar photosphere at 24 mum, and 21 sources with excesses at 70 mum. Five sources with an infrared excess have characteristics of optically thick primordial disks, while the remaining sources have properties akin to debris systems. The fraction of systems exhibiting a 24 mum excess greater than 10.2% above the photosphere is 15% for ages < 300 Myr and declines to 2.7% for older ages. The upper envelope to the 70 mum fractional luminosity appears to decline over a similar age range. The characteristic temperature of the debris inferred from the IRS spectra range between 60 and 180 K, with evidence for the presence of cooler dust to account for the strength of the 70 mum excess emission. No strong correlation is found between dust temperature and stellar age. Comparison of the observational data with disk models containing a power-law distribution of silicate grains suggests that the typical inner-disk radius is gsim 10 AU. Although the interpretation is not unique, the lack of excess emission shortward of 16 mum and the relatively flat distribution of the 24 mum excess for ages lsim 300 Myr is consistent with steady-state collisional models.
Free Keywords:circumstellar matter; infrared: stars; planetary systems: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009ApJS..181..197C [ID No:1]
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