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

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dc.contributor.author Silverstone, Murray
dc.date.accessioned 2019-06-17T16:40:57Z
dc.date.available 2019-06-17T16:40:57Z
dc.date.issued 2006-02-20 en_US
dc.identifier.citation Hines, D., et al. (2006): The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039. The Astronomical Journal, 638(2). DOI: https://doi.org/10.1086/498929 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5769
dc.description.abstract 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 (L_IR/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 10^2 yr. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject circumstellar matter en_US
dc.subject infrared: stars en_US
dc.subject planetary systems: protoplanetary disks en_US
dc.subject stars: individual (HD 12039) en_US
dc.title The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039 en_US
dc.type text en_US


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