HD 98800: A 10 Myr Old Transition Disk

  title={HD 98800: A 10 Myr Old Transition Disk},
  author={Elise Furlan and Benjamin A. Sargent and Nuria Calvet and William J. Forrest and Paola d’Alessio and Lee Hartmann and Dan M. Watson and Joel D. Green and Joan Rie Najita and C.-H. Chen},
  journal={The Astrophysical Journal},
  pages={1176 - 1184}
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 98800B displays no excess emission below about 5.5 μm, implying an optically thick disk wall at 5.9 AU and an inner, cleared-out region; however, some… 

A Slowly Accreting ~10 Myr-old Transitional Disk in Orion OB1a

Here we present the Spitzer IRS spectrum of CVSO 224, the sole transitional disk located within the ~10 Myr old 25 Orionis group in Orion OB1a. A model fit to the spectral energy distribution of this

A Sub-AU Outwardly Truncated Accretion Disk around a Classical T Tauri Star

We present the Spitzer Infrared Spectrograph (IRS) spectrum of SR 20, a 5-10 AU binary T Tauri system in the ρ Ophiuchi star-forming region. The spectrum has features consistent with the presence of

Long-lived Protoplanetary Disks in Multiple Systems: The VLA View of HD 98800

The conditions and evolution of protoplanetary disks in multiple systems can be considerably different from those around single stars, which may have important consequences for planet formation. We


We present high angular resolution (down to 0.″3 ≈ 13 AU in diameter) Submillimeter Array observations of the 880 μm (340 GHz) thermal continuum emission from circumstellar dust disks in the nearby

Debris Disks in NGC 2547

We have surveyed the 30 Myr old cluster NGC 2547 for planetary debris disks using Spitzer. At 4.5-8 μm we are sensitive to the photospheric level down to mid-M stars (0.2 M☉), and at 24 μm to early G

Transient dust in warm debris disks - Detection of Fe-rich olivine grains

Context. Debris disks trace remnant reservoirs of leftover planetesimals in planetary systems. In the past years, a handful of “warm” debris disks have been discovered in which emission in excess


Protoplanetary disks with AU-scale inner clearings, often referred to as transitional disks, provide a unique sample for understanding disk dissipation mechanisms and possible connections to planet


Circumstellar disks are thought to experience a rapid “transition” phase in their evolution that can have a considerable impact on the formation and early development of planetary systems. We present


We present high-resolution M-band (∼5 μm) spectra of 14 transitional disks—circumstellar disks with an optically thick outer zone but an inner region significantly depleted of small dust

Evolution from protoplanetary to debris discs: the transition disc around HD 166191

HD 166191 has been identified by several studies as hosting a rare and extremely bright warm debris disc with an additional outer cool disc component. However, an alternative interpretation is that



Evidence for a Developing Gap in a 10 Myr Old Protoplanetary Disk

We have developed a physically self-consistent model of the disk around the nearby 10 Myr old star TW Hya that matches the observed spectral energy distribution and 7 mm images of the disk. The model

The Accretion Disk of the Lithium-depleted Young Binary St 34

We present the infrared spectrum of the young binary system St 34 obtained with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope. The IRS spectrum clearly shows excess dust emission,

Mid-infrared Spectroscopy of Disks around Classical T Tauri Stars

We present the first Spitzer Space Telescope Infrared Spectrograph observations of the disks around classical T Tauri stars: spectra in the 5.2-30 μm range of six stars. The spectra are dominated by

The Truncated Disk of CoKu Tau/4

We present a model of a dusty disk with an inner hole that accounts for the Spitzer Space Telescope Infrared Spectrograph observations of the low-mass pre-main-sequence star CoKu Tau/4. We have

The State of Protoplanetary Material 10 Million years after Stellar Formation: Circumstellar Disks in the TW Hydrae Association

We have used the Spitzer Space Telescope Infrared Spectrograph to observe seven members of the TW Hya association, the nearest stellar association whose age (∼10 Myr) is similar to the timescales

Disks in Transition in the Taurus Population: Spitzer IRS Spectra of GM Aurigae and DM Tauri

We present Spitzer Infrared Spectrograph (IRS) observations of two objects of the Taurus population that show unambiguous signs of clearing in their inner disks. In one of the objects, DM Tau, the

A Disk Census for the Nearest Group of Young Stars: Mid-Infrared Observations of the TW Hydrae Association

A group of young, active stars in the vicinity of TW Hydrae has recently been identified as a possible physical association with a common origin. Given its proximity (~50 pc), age (~10 Myr), and

Mid-Infrared Imaging of the Young Binary Star Hen 3-600: Evidence for a Dust Disk around the Primary

We present high-resolution mid-infrared observations of the nearby late-type young binary system Hen 3-600. The binary, at a distance of ~50 pc, could be a member of the TW Hydrae association, the

Thermal Infrared Images of the Remarkable Young Nearby Multiple Star HD 98800

We present thermal infrared images of the unusual multiple stellar system HD 98800, which contains two double-star systems (A and B) separated by ≈0.″8 in the north/south direction. This system may

A Long-lived Accretion Disk around a Lithium-depleted Binary T Tauri Star

We present a high-dispersion optical spectrum of St 34 and identify the system as a spectroscopic binary with components of similar luminosity and temperature (both M3 ± 0.5). Based on kinematics,