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Published February 20, 2006 | Submitted + Published
Journal Article Open

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

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 ɑ ~ 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.

Additional Information

© 2006 American Astronomical Society. Received 2005 March 3. Accepted 2005 October 8. It is a pleasure to acknowledge all the members of the FEPS legacy science team for their contributions to the project. We thank C. Beichman for sharing information about HD 69830 prior to publication and an anonymous referee whose constructive criticism helped to improve our presentation. This work has used the SIMBAD databases, and is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Our investigation has also made use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. FEPS is pleased to acknowledge support from NASA contracts 1224768, 1224634, and 1224566 administered through JPL. The MPIA team is supported by the EU-RTN-HPRN-CT-2002-00308 PLANETS network and the German Research Foundation (DFG) through the Emmy Noether grant WO 857/2-1.

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Published - Hines_2006_ApJ_638_1070.pdf

Submitted - 0510294.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 26, 2023