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, K. L. Luhman, N. Calvet, C. Espaillat, P. D'Alessio, L. W. Hartmann, C. Tayrien, S. T. Harrold

Research output: Contribution to journalArticle

11 Citations (Scopus)

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..03 -0.01AU, much smaller than predicted by models of binary orbits. Using a two-temperature x2 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.

Original languageEnglish (US)
Pages (from-to)L187-L190
JournalAstrophysical Journal
Volume683
Issue number2 PART 2
DOIs
StatePublished - Jan 1 2008

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T Tauri stars
accretion disks
accretion
spectrographs
thick walls
slopes
spectral energy distribution
opacity
photometry
dust
perturbation
continuums
orbits
stars
optimization
radii
energy
temperature

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

McClure, M. K., Forrest, W. J., Sargent, B. A., Watson, D. M., Furlan, E., Manoj, P., ... Harrold, S. T. (2008). A Sub-Au outwardly truncated accretion disk around a classical T Tauri star. Astrophysical Journal, 683(2 PART 2), L187-L190. https://doi.org/10.1086/591666
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. / A Sub-Au outwardly truncated accretion disk around a classical T Tauri star. In: Astrophysical Journal. 2008 ; Vol. 683, No. 2 PART 2. pp. L187-L190.
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McClure, MK, Forrest, WJ, Sargent, BA, Watson, DM, Furlan, E, Manoj, P, Luhman, KL, Calvet, N, Espaillat, C, D'Alessio, P, Hartmann, LW, Tayrien, C & Harrold, ST 2008, 'A Sub-Au outwardly truncated accretion disk around a classical T Tauri star', Astrophysical Journal, vol. 683, no. 2 PART 2, pp. L187-L190. https://doi.org/10.1086/591666

A Sub-Au outwardly truncated accretion disk around a classical T Tauri star. / 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.

In: Astrophysical Journal, Vol. 683, No. 2 PART 2, 01.01.2008, p. L187-L190.

Research output: Contribution to journalArticle

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McClure MK, Forrest WJ, Sargent BA, Watson DM, Furlan E, Manoj P et al. A Sub-Au outwardly truncated accretion disk around a classical T Tauri star. Astrophysical Journal. 2008 Jan 1;683(2 PART 2):L187-L190. https://doi.org/10.1086/591666