HD 98800: A 10-Myr-Old Transition Disk

Abstract

We present the mid-infrared spectrum, obtained with the Spitzer Infrared Spectrograph (IRS), of HD 98800, a quadruple star system located in the 10-Myr-old TW Hydrae association. It has a known mid-infrared excess that arises from a circumbinary disk around the B components of the system. The IRS spectrum confirms that the disk around HD 98800 B displays no excess emission below about 5.5 micron, implying an optically thick disk wall at 5.9 AU and an inner, cleared-out region; however, some optically thin dust, consisting mainly of 3-micron-sized silicate dust grains, orbits the binary in a ring between 1.5 and 2 AU. The peculiar structure and apparent lack of gas in the HD 98800 B disk suggests that this system is likely already at the debris disks stage, with a tidally truncated circumbinary disk of larger dust particles and an inner, second-generation dust ring, possibly held up by the resonances of a planet. The unusually large infrared excess can be explained by gravitational perturbations of the Aa+Ab pair puffing up the outer dust ring and causing frequent collisions among the larger particles.

10 pages, 8 figures

References in corpus (24)

• The Spitzer Space Telescope Mission
• The Infrared Spectrograph on the Spitzer Space Telescope
• Long-Term Stability of Planets in Binary Systems
• Evidence for a developing gap in a 10 Myr old protoplanetary disk
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• The SMART Data Analysis Package for the Infrared Spectrograph on the Spitzer Space Telescope
• Discovery of seven T Tauri stars and a brown dwarf candidate in the nearby TW Hydrae Association
• The Truncated Disk of CoKu Tau/4
• CO emission from discs around isolated HAeBe and Vega-excess stars
• Spectral Irradiance Calibration in the Infrared. XIII. "Supertemplates" and On-Orbit Calibrators for SIRTF's Infrared Array Camera (IRAC)
• Evidence for early stellar encounters in the orbital distribution of Edgeworth-Kuiper Belt objects
• On the Planet and the Disk of CoKuTau/4
• Exploring Terrestrial Planet Formation in the TW Hydrae Association
• Mid-Infrared Spectroscopy of Disks around Classical T Tauri Stars
• The state of protoplanetary material 10 Myr after stellar formation: circumstellar disks in the TW Hydrae association
• Collisional Cascades in Planetesimal Disks I. Stellar Flybys
• Dynamical Masses for Low-Mass Pre-Main Sequence Stars: A Preliminary Physical Orbit for HD 98800 B
• A disk census for the nearest group of young stars: Mid-infrared observations of the TW Hydrae Association
• Dust Processing in Disks around T Tauri Stars
• Keck Diffraction-Limited Imaging of the Young Quadruple Star System HD 98800
• A Long-Lived Accretion Disk Around a Lithium-Depleted Binary T Tauri Star
• A Single Circumbinary Disk in the HD 98800 Quadruple System
• Mid-infrared imaging of the young binary star Hen 3-600: Evidence for a dust disk around the primary
• Signatures of Planets in Spatially Unresolved Disks

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• Resolved Images of Large Cavities in Protoplanetary Transition Disks
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• The Disk Population of the Chamaeleon I Star-Forming Region
• An Infrared/X-ray Survey for New Members of the Taurus Star-Forming Region
• Giant planet migration, disk evolution, and the origin of transitional disks
• A Spitzer Census of Transitional Protoplanetary Disks with AU-Scale Inner Holes
• Tidal evolution of hierarchical and inclined systems
• A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars
• Dust Processing and Grain Growth in Protoplanetary Disks in the Taurus-Auriga Star-Forming Region
• The bright end of the exo-Zodi luminosity function: Disk evolution and implications for exo-Earth detectability
• A circumbinary protoplanetary disc in a polar configuration
• New Low-Mass Stars and Brown Dwarfs with Disks in the Chamaeleon I Star-Forming Region
• Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
• Transient dust in warm debris disks - Detection of Fe-rich olivine grains
• Truncated Disks in TW Hya Association Multiple Star Systems
• The dispersal of protoplanetary disks around binary stars
• Kuiper Belts Around Nearby Stars
• Debris Disks in NGC 2547
• The widest H$\alpha$ survey of accreting protoplanets around nearby transition disks
• Mid-Infrared Spectral Variability Atlas of Young Stellar Objects
• Gas and dust in the TW Hydrae Association as seen by the Herschel Space Observatory
• A slowly accreting ~10 Myr old transitional disk in Orion OB1a
• A Chandra Study of the Rosette Star-Forming Complex. II. Clusters in the Rosette Molecular Cloud
• A Census of the TW Hya Association with Gaia
• EF Cha: Warm Dust Orbiting a Nearby 10 Myr Old Star
• Binary Star Formation and the Outflows from their Discs
• Wall emission in circumbinary disks: the case of CoKu Tau/4
• The circumbinary disk of HD 98800 B: Evidence for disk warping
• GSC 07396-00759 = V4046 Sgr C[D]: a Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB
• HD 98800: A most unusual debris disc
• The Proposed Quadruple System SZ Herculis: Revised LITE Model and Orbital Stability Study
• New Spatially Resolved Observations of the T Cha Transition Disk and Constraints on the Previously Claimed Substellar Companion
• Multiplicity of disc-bearing stars in Upper Scorpius and Upper Centaurus-Lupus
• Observational Constraints on the Stellar Radiation Field Impinging on Transitional Disk Atmospheres
• Evolution from protoplanetary to debris discs: The transition disc around HD 166191
• The role of turbulence during the formation of circumbinary discs
• Long-lived protoplanetary disks in multiple systems: the VLA view of HD 98800
• A sub-AU outwardly truncated accretion disk around a classical T Tauri star
• Earth-size planet formation in the habitable zone of circumbinary stars
• Nature or nurture of coplanar Tatooines: the aligned circumbinary Kuiper belt analogue around HD 131511
• On the RZ Draconis Sub-stellar Circumbinary Companions Stability Study of the Proposed Sub-stellar Circumbinary System
• Water and OH Emission from the inner disk of a Herbig Ae/Be star
• A GLIMPSE into the Nature of Galactic Mid-IR Excesses
• Large Dust Grains and a Possible Dust Trap in the Polar Circumbinary Disc of HD 98800B
• Star Formation