Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-02
McClure, M.K., et al. 2008, ApJL, 683, L187
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, 1 table, accepted to ApJ Letters
Scientific paper
10.1086/591666
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 a large increase in the mid-infrared flux from 1993 to 1996. We model the spectral energy distribution and IRS spectrum with a wall + optically thick irradiated disk, yielding an outer radius of 0.39$_{+0.03}^{-0.01}$ AU, much smaller than predicted by models of binary orbits. Using a two temperature $\chi^2$ minimization model to fit the dust composition of the IRS spectrum, we find the disk has experienced significant grain growth: its spectrum is well-fit using opacities of grains larger than 1 $\mu$m. We conclude that the system experienced a significant gravitational perturbation in the 1990s.
Calvet Nuria
D'Alessio Paola
Espaillat Catherine
Forrest William John
Furlan Elise
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