The Formation and Evolution of Planetary Systems (FEPS): Discovery of an unusual debris system associated with HD 12039

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

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

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 (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 ∼ 110K, 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.

Original languageEnglish (US)
Pages (from-to)1070-1079
Number of pages10
JournalAstrophysical Journal
Volume638
Issue number2 I
DOIs
StatePublished - Feb 20 2006

Keywords

  • Circumstellar matter
  • Infrared: stars
  • Planetary systems: protoplanetary disks
  • Stars: individual (HD 12039)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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