Solar System Analogs Around IRAS-Discovered Debris Disks

Abstract

We have rereduced Spitzer IRS spectra and reanalyzed the SED's of three nearby debris disks: lambda Boo, HD 139664, and HR 8799. We find that that the thermal emission from these objects is well modeled using two single temperature black body components. For HR 8799 -- with no silicate emission features despite a relatively hot inner dust component (Tgr = 150 K) -- we infer the presence of an asteroid belt interior to and a Kuiper Belt exterior to the recently discovered orbiting planets. For HD 139664, which has been imaged in scattered light, we infer the presence of strongly forward scattering grains, consistent with porous grains, if the cold, outer disk component generates both the observed scattered light and thermal emission. Finally, careful analysis of the lambda Boo SED suggests that this system possesses a central clearing, indicating that selective accretion of solids onto the central star does not occur from a dusty disk.

8 pages, 2 figures (including 2 color figures), ApJ, in press

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Cited by in corpus (41)

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• Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
• The Formation Mechanism of Gas Giants on Wide Orbits
• Asteroid Belts in Debris Disk Twins: VEGA and FOMALHAUT
• Spatially resolved spectroscopy of the exoplanet HR 8799 c
• Do Two Temperature Debris Disks Have Multiple Belts?
• Analysis of the Herschel DEBRIS Sun-like star sample
• Structure and evolution of debris disks around F-type stars: I. Observations, database and basic evolutionary aspects
• Resolved Submillimeter Observations of the HR 8799 and HD 107146 Debris Disks
• Binaries Among Debris Disk Stars
• A Trend Between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-Orbit Planets
• A gap in the planetesimal disc around HD 107146 and asymmetric warm dust emission revealed by ALMA
• Variations on Debris Disks II. Icy Planet Formation as a Function of the Bulk Properties and Initial Sizes of Planetesimals
• The Exozodiacal Dust Problem for Direct Observations of ExoEarths
• Locating the planetesimals belts in the multiple-planet systems HD 128311, HD 202206, HD 82943 and HR 8799
• Debris Distribution in HD 95086 - A Young Analog of HR 8799
• Correlations between the stellar, planetary and debris components of exoplanet systems observed by $\text{Herschel}$
• High-spatial-resolution imaging of thermal emission from debris disks
• A gap in HD 92945's broad planetesimal disc revealed by ALMA
• Collisional evolution of eccentric planetesimal swarms
• Polarization measurements of hot dust stars and the local interstellar medium
• On the formation and evolution of asteroid belts and their potential significance for life
• Resolved Millimeter-Wavelength Observations of Debris Disks around Solar-Type Stars
• Orbital Stability of Multi-Planet Systems: Behavior at High Masses
• Circumstellar Debris Disks: Diagnosing the Unseen Perturber
• ALMA Survey of Lupus Class III Stars: Early Planetesimal Belt Formation and Rapid Disk Dispersal
• Confirming the Primarily Smooth Structure of the Vega Debris Disk at Millimeter Wavelengths
• The planetary system host HR\,8799: On its $\lambda$ Bootis nature
• Herschel Observations of Dusty Debris Disks
• JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO${}_2$ in the HR 8799 and 51 Eri Exoplanets' Atmospheres
• Warm dusty discs: Exploring the A star 24um debris population
• IR-excesses around nearby Lambda Boo stars are caused by debris disks rather than ISM bow waves
• Dust discs around intermediate mass and Sun-like stars in the 16 Myr old NGC 1960 open cluster
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm
• A Herschel resolved debris disc around HD 105211
• On the incidence of \textit{WISE} infrared excess among solar analog, twin and sibling stars
• Gap Formation in Planetesimal Disks Via Divergently Migrating Planets
• Takeout and Delivery: Erasing the Dusty Signature of Late-stage Terrestrial Planet Formation
• Detecting Extrasolar Asteroid Belts Through Their Microlensing Signatures
• Discovery of lambda Boo stars in open clusters