The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039

Hines, Dean C.; Backman, Dana E.; Bouwman, Jeroen; Hillenbrand, Lynne A.; Carpenter, John M.; Meyer, Michael R.; Kim, Jinyoung Serena; Silverstone, Murray D.; Rodmann, Jens; Wolf, Sebastian; Mamajek, Eric E.; Brooke, Timothy Y.; Padgett, Deborah L.; Henning, Thomas; Moro-MartÍn, Amaya; Stobie, E.; Gordon, Karl D.; Morrison, J. E.; Muzerolle, J.; & Su, K. Y. L.
2006, The Astrophysical Journal, 638, 1070

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 μm. An observed infrared excess (LIR/L*=1×10-4) above the expected photosphere for λ>~14 μm 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 μm with a 3 σ 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 μm 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 μm, 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.


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