The debris disk around γ doradus resolved with Herschel

Hannah Broekhoven-Fiene, Brenda C. Matthews, Grant M. Kennedy, Mark Booth, Bruce Sibthorpe, Samantha M. Lawler, J. J. Kavelaars, Mark C. Wyatt, Chenruo Qi, Alice Koning, Kate Y.L. Su, George H. Rieke, David J. Wilner, Jane S. Greaves

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We present observations of the debris disk around γ Doradus, an F1V star, from the Herschel Key Programme DEBRIS (Disc Emission via Bias-free Reconnaissance in the Infrared/Submillimetre). The disk is well resolved at 70, 100, and 160 μm, resolved along its major axis at 250 μm, detected but not resolved at 350 μm, and confused with a background source at 500 μm. It is one of our best resolved targets and we find it to have a radially broad dust distribution. The modeling of the resolved images cannot distinguish between two configurations: an arrangement of a warm inner ring at several AU (best fit 4 AU) and a cool outer belt extending from ∼55 to 400 AU or an arrangement of two cool, narrow rings at ∼70 AU and ∼190 AU. This suggests that any configuration between these two is also possible. Both models have a total fractional luminosity of ∼10-5 and are consistent with the disk being aligned with the stellar equator. The inner edge of either possible configuration suggests that the most likely region to find planets in this system would be within ∼55 AU of the star. A transient event is not needed to explain the warm dust's fractional luminosity.

Original languageEnglish (US)
Article number52
JournalAstrophysical Journal
Volume762
Issue number1
DOIs
StatePublished - Jan 1 2013

Keywords

  • circumstellar matter
  • infrared: stars
  • stars: individual (γ Doradus, HD 27290, HIP 19893)
  • submillimeter: stars
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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