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23 April 2024 |
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A sub-AU outwardly truncated accretion disk around a classical T Tauri star | | M. K. McClure
; W. J. Forrest
; B. A. Sargent
; Dan M. Watson
; E. Furlan
; P. Manoj
; C. Tayrien
; S. T. Harrold
; N. Calvet
; L. W. Hartmann
; | | Date: |
2 Jan 2008 | | Abstract: | We present the Spitzer Infrared Spectrograph (IRS) spectrum of SR20, a 5--10
AU binary T Tauri system in the rho Ophiuchi star forming region. The spectrum
has features consistent with the presence of a disk; however, the continuum
slope is steeper than the lambda^{-4/3} slope of an infinite geometrically
thin, optically thick disk, indicating that the disk is outwardly truncated.
Comparison with photometry from the literature shows large variability from
1993 to 1996. We model the spectral energy distribution and IRS spectrum with a
geometrically thin, optically thick irradiated disk, yielding an outer radius
of 0.15 AU, much smaller than predicted by models of binary orbits. Using a two
temperature chi-squared minimization model to fit the dust composition of the
IRS spectrum, we find the disk is comprised of large (5 micron) amorphous
olivine grains. These results lead us to conclude that there is likely an
unseen companion orbiting close to the primary. | | Source: | arXiv, 0801.0402 | | Services: | Forum | Review | PDF | Favorites | |
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