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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308728.0, MPI für Astronomie / Publikationen_mpia
The formation and evolution of planetary systems (FEPS): Discovery of an unusual debris system associated with HD 12039
Authors:Hines, D. C.; Backman, D. E.; Bouwman, J.; Hillenbrand, L. A.; Carpenter, J. M.; Meyer, M. R.; Kim, J. S.; Silverstone, M. D.; Rodmann, J.; Wolf, S.; Mamajek, E. E.; Brooke, T. Y.; Padgett, D. L.; Henning, T.; Moro-MartÍn, A.; Stobie, E.; Gordon, K. D.; Morrison, J. E.; Muzerolle, J.; Su, K. Y. L.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:1070
End Page:1079
Audience:Not Specified
Abstract / Description:We report the discovery of a debris system associated with the ~30 Myr old G3/5V star HD 12039 using Spitzer Space Telescope observations from 3.6-160 mum. An observed infrared excess (LIR/L*=1×10-4) above the expected photosphere for lambda>~14 mum is fit by thermally emitting material with a color temperature of T~110 K, warmer than the majority of debris disks identified to date around Sun-like stars. The object is not detected at 70 mum with a 3 sigma upper limit 6 times the expected photospheric flux. The spectrum of the infrared excess can be explained by warm, optically thin material comprised of blackbody-like grains of size >~7 mum that reside in a belt orbiting the star at 4-6 AU. An alternate model dominated by smaller grains, near the blowout size a~0.5 mum, located at 30-40 AU is also possible but requires the dust to have been produced recently, since such small grains will be expelled from the system by radiation pressure in approximately a few times 102 yr.
Free Keywords:Stars: Circumstellar Matter; Infrared: Stars; Stars: Planetary Systems: Protoplanetary Disks; stars: individual (HD 12039)
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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