Characterizing the disk around the TW Hydrae Association brown dwarf 2MASSW J1207334-393254

Abstract

We present detailed modeling of the disk around the TW Hydrae Association (TWA) brown dwarf 2MASSW J1207334-393254 (2M1207), using {\it Spitzer} observations from 3.6 to 24 $\micron$. The spectral energy distribution (SED) does not show a high amount of flaring. We have obtained a good fit using a flat disk of mass between $10^{-4}$ and $10^{-6}$ $M_{\sun}$, $\dot{M}$ $\la10^{-11} M_{\sun}$/yr and a large inclination angle between 60$\degr$ and 70$\degr$. We have used three different grain models to fit the 10 $\micron$ Si emission feature, and have found the results to be consistent with ISM-like dust. In comparison with other TWA members, this suggests lesser dust processing for 2M1207 which could be explained by mechanisms such as aggregate fragmentation and/or turbulent mixing. We have found a good fit using an inner disk radius equal to the dust sublimation radius, which indicates the absence of an inner hole in the disk. This suggests the presence of a small K-$L^{\prime }$ excess, similar to the observed K-[3.6] excess.

19 pages, 4 figures, accepted in ApJ

References in corpus (7)

• Exploring brown dwarf disks: A 1.3 mm survey in Taurus
• The Planetary Mass Companion 2MASS1207-3932 B: Temperature, Mass and Evidence for an Edge-On Disk
• On the age of the TW Hydrae Association and 2M1207334-393254
• Young, Low-Mass Brown Dwarfs with Mid-Infrared Excesses
• Investigating grain growth in disks around southern T Tauri stars at millimetre wavelengths
• HST NICMOS Imaging of the Planetary-mass Companion to the Young Brown Dwarf 2MASS J1207334-393254
• Spitzer Observations of two TW Hydrae Association Brown Dwarfs

Cited by in corpus (12)

• The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
• Hot Gas Lines in T Tauri Stars
• An Improbable Solution to the Underluminosity of 2M1207B: A Hot Protoplanet Collision Afterglow
• The Trigonometric Parallax of the Brown Dwarf Planetary System 2MASSW J1207334-393254
• New Brown Dwarf Disks in the TW Hydrae Association
• A Herschel Search For Cold Dust in Brown Dwarf Disks: First Results
• Surprisingly Weak Magnetism on Young Accreting Brown Dwarfs
• Metal Depletion and Warm H2 in the Brown Dwarf 2M1207 Accretion Disk
• The radial distribution of dust species in young brown dwarf disks
• Brown Dwarf Disks at Ages of 5-10 Myr
• Revised analysis of SPIRE observations for 2M1207
• JWST/MIRI observations of the young TWA 27 system: hydrocarbon disk chemistry, silicate clouds, evidence for a CPD