THE DEBRIS DISK AROUND gamma 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We present observations of the debris disk around. 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 mu m, resolved along its major axis at 250 mu m, detected but not resolved at 350 mu m, and confused with a background source at 500 mu m. 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 similar to 55 to 400 AU or an arrangement of two cool, narrow rings at similar to 70 AU and similar to 190 AU. This suggests that any configuration between these two is also possible. Both models have a total fractional luminosity of similar to 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 similar to 55 AU of the star. A transient event is not needed to explain the warm dust's fractional luminosity.

Original languageEnglish
Article number52
Number of pages11
JournalAstrophysical Journal
Volume762
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • circumstellar matter
  • infrared: stars
  • stars: individual (gamma Doradus, HD 27290, HIP 19893) submillimeter: stars
  • techniques: photometric
  • SUN-LIKE STARS
  • NEARBY STARS
  • KUIPER-BELT
  • SUBMILLIMETER IMAGES
  • SOLAR-SYSTEM
  • DUSTY DEBRIS
  • HR 8799
  • PLANETS
  • SPITZER
  • RING

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