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20 April 2024 |
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Evolution of Young Brown Dwarf Disks in the Mid-Infrared | | Michael F. Sterzik
; Ilaria Pascucci
; Daniel Apai
; Nicole van der Bliek
; Cornelis P. Dullemond
; | | Date: |
21 Jun 2004 | | Subject: | astro-ph | | Abstract: | We have imaged two bona-fide brown dwarfs with TReCS/GEMINI-S and find mid-infrared excess emission that can be explained by optically thick dust disk models. In the case of the young ($approx$2Myr) Cha H$alpha$1 we measure fluxes at 10.4$mu$m and 12.3$mu$m that are fully consistent with a standard flared disk model and prominent silicate emission. For the $approx$ 10Myr old brown dwarf 2MASS1207-3932 located in the TW Hydrae association we find excess emission at 8.7$mu$m and 10.4$mu$m with respect to its photosphere, and confirm disk accretion as likely cause of its strong activity. Disks around brown dwarfs likely last at least as long as their low-mass stellar counterparts in the T-Tauri phase. Grain growth, dust settling, and evolution of the geometry of brown dwarfs disks may appear on a timescale of 10Myr and can be witnessed by observations in the mid-infrared. | | Source: | arXiv, astro-ph/0406460 | | Services: | Forum | Review | PDF | Favorites | |
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