First sub-millimeter detection of the TWA brown dwarf disc 2MASSW J1207334-393254

Details First sub-millimeter detection of the TWA brown dwarf disc 2MASSW J1207334-393254 First sub-millimeter detection of the TWA brown dwarf disc 2MASSW J1207334-393254

2012-01-19

arxiv.org/abs/1201.4173v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted in MNRAS Letters

Scientific paper

We present Herschel/SPIRE observations for the 2MASS1207334-393254 (2M1207) system. Based on radiative transfer modeling of near-infrared to sub-millimeter data, we estimate a disc mass of 3+/-2 M_Jup and an outer disc radius of 50--100 AU for the 2M1207A disc. The relative disc mass for 2M1207A is similar to the T Tauri star TW Hya, which indicates that massive discs are not underabundant around sub-stellar objects. In probing the various formation mechanisms for this system, we find that core accretion is highly uncertain mainly due to the large separation between the primary and the companion. Disk fragmentation could be a likely scenario based on analytical models, and if the disc initially was more massive than its current estimate. Considering that the TWA is sparsely populated, this system could have formed via one of the known binary formation mechanisms (e.g. turbulent fragmentation of a core) and survived disruption at an early stage.

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