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Title:
A Sub-AU Outwardly Truncated Accretion Disk around a Classical T Tauri Star
Authors:
McClure, M. K.; Forrest, W. J.; Sargent, B. A.; Watson, Dan M.; Furlan, E.; Manoj, P.; Luhman, K. L.; Calvet, N.; Espaillat, C.; D'Alessio, P.; Hartmann, L. W.; Tayrien, C.; Harrold, S. T.
Affiliation:
AA(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AB(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AC(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AD(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AE(NASA Postdoctoral Program Fellow. NASA Astrobiology Institute, and Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Los Angeles, CA 90095; .), AF(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AG(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802; .), AH(Department of Astronomy, University of Michigan, 500 Church Street, 830 Dennison Building, Ann Arbor, MI 48109; , , .), AI(Department of Astronomy, University of Michigan, 500 Church Street, 830 Dennison Building, Ann Arbor, MI 48109; , , .), AJ(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58089 Morelia, Michoacán, México .), AK(Department of Astronomy, University of Michigan, 500 Church Street, 830 Dennison Building, Ann Arbor, MI 48109; , , .), AL(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .), AM(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627; , , , , , , .)
Publication:
The Astrophysical Journal, Volume 683, Issue 2, pp. L187-L190. (ApJL Homepage)
Publication Date:
08/2008
Origin:
UCP
ApJ Keywords:
Stars: Binaries: Close, Stars: Circumstellar Matter, Infrared: Stars, stars: individual (SR 20), Stars: Pre-Main-Sequence
DOI:
10.1086/591666
Bibliographic Code:
2008ApJ...683L.187M

Abstract

We present the Spitzer Infrared Spectrograph (IRS) spectrum of SR 20, a 5-10 AU binary T Tauri system in the ρ Ophiuchi star-forming region. The spectrum has features consistent with the presence of a disk; however, the continuum slope is steeper than the λ-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 0.39-0.01+0.03 AU, much smaller than predicted by models of binary orbits. Using a two-temperature χ2 minimization model to fit the dust composition of the IRS spectrum, we find that the disk has experienced significant grain growth: its spectrum is well fitted using opacities of grains larger than 1 μm. We conclude that the system experienced a significant gravitational perturbation in the 1990s.
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