Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks
arXiv:1610.01173 · doi:10.3847/1538-4357/833/2/183
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 re-analyzed 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 PSF size (50% of energy enclosed within radius 4.23"). HD 105211 also has a 24-micron infrared excess that was previously overlooked because of a poorly constrained photospheric model. Archival Spitzer IRS observations indicate that the disks have small grains of minimum radius ~3 microns, though the minimum grain gradius 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 model blackbody disks. We find that the Herschel photometry traces dust near the source population of planetesimals. The disk luminosities are in the range 0.00002 <= L/L* <= 0.0002, consistent with collisions in icy planetesimal belts stirred by Pluto-size dwarf planets.
Accepted for publication in ApJ. 18 pages, including 10 figures and 3 tables
References in corpus (17)
- Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
- A Catalog of Multiplicity among Bright Stellar Systems
- Debris disks around Sun-like stars
- New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets
- Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
- Do Two Temperature Debris Disks Have Multiple Belts?
- Revising the ages of planet-hosting stars
- Disk Radii and Grain Sizes in Herschel-Resolved Debris Disks
- Discovery of extreme asymmetry in the debris disk surrounding HD 15115
- The Mass of the Candidate Exoplanet Companion to HD 33636 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
- Debris Distribution in HD 95086 - A Young Analog of HR 8799
- Formation of Super-Earth Mass Planets at 125-250 AU from a Solar-type Star
- q1 Eri: a solar-type star with a planet and a dust belt
- Discovery of an extended debris disk around the F2V star HD 15745
- Spectroscopic metallicities of Vega-like stars
- Searching for Planets in Holey Debris Disks with the Apodizing Phase Plate
- Near-Infrared Image of the Debris Disk around HD 15115