HERSCHEL OBSERVATIONS and UPDATED SPECTRAL ENERGY DISTRIBUTIONS of FIVE SUNLIKE STARS with DEBRIS DISKS

Sarah E. Dodson-Robinson, Kate Y.L. Su, Geoff Bryden, Paul Harvey, Joel D. Green

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Observations from the Herschel Space Observatory have more than doubled the number of wide debris disks orbiting Sunlike stars to include over 30 systems with R > 100 AU. Here, we present new Herschel PACS and reanalyzed Spitzer MIPS photometry of five Sunlike stars with wide debris disks, from Kuiper Belt size to R > 150 AU. The disk surrounding HD 105211 is well resolved, with an angular extent of >14″ along the major axis, and the disks of HD 33636, HD 50554, and HD 52265 are extended beyond the PACS point-spread function size (50% of energy enclosed within radius 4.″23). HD 105211 also has a 24 μm infrared excess, which was previously overlooked, because of a poorly constrained photospheric model. Archival Spitzer IRS observations indicate that the disks have small grains of minimum radius a min ∼ 3 μm, although a min is larger than the radiation-pressure blowout size in all systems. If modeled as single-temperature blackbodies, the disk temperatures would all be <60 K. Our radiative transfer models predict actual disk radii approximately twice the radius of a model blackbody disk. We find that the Herschel photometry traces dust near the source population of planetesimals. The disk luminosities are in the range 2 ×10-5 L/L o 2 ×10-4, consistent with collisions in icy planetesimal belts stirred by Pluto-size dwarf planets.

Original languageEnglish (US)
Article number183
JournalAstrophysical Journal
Volume833
Issue number2
DOIs
StatePublished - Dec 20 2016
Externally publishedYes

Keywords

  • circumstellar matter
  • infrared: planetary systems
  • stars: individual (eta Cru, HD 33636, HD 50554, HD 52265)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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