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    Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties

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    2011_11_Cieza.pdf (522.8Kb)
    Date
    2011-11
    Author
    Cieza, Lucas A.
    Olofsson, Johan
    Harvey, Paul M.
    Pinte, Christophe
    Merin, Bruno
    Augereau, Jean-Charles
    Evans, Neal J., II
    Najita, Joan
    Henning, Thomas
    Menard, Francois
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    Abstract
    T Cha is a nearby (d similar to 100 pc) transition disk known to have an optically thin gap separating optically thick inner and outer disk components. Huelamo et al. recently reported the presence of a low-mass object candidate within the gap of the T Cha disk, giving credence to the suspected planetary origin of this gap. Here we present the Herschel photometry (70, 160, 250, 350, and 500 mu m) of T Cha from the "Dust, Ice, and Gas in Time" Key Program, which bridges the wavelength range between existing Spitzer and millimeter data and provide important constraints on the outer disk properties of this extraordinary system. We model the entire optical to millimeter wavelength spectral energy distribution (SED) of T Cha (19 data points between 0.36 and 3300 mu m without any major gaps in wavelength coverage). T Cha shows a steep spectral slope in the far-IR, which we find clearly favors models with outer disks containing little or no dust beyond similar to 40 AU. The full SED can be modeled equally well with either an outer disk that is very compact (only a few AU wide) or a much larger one that has a very steep surface density profile. That is, T Cha's outer disk seems to be either very small or very tenuous. Both scenarios suggest a highly unusual outer disk and have important but different implications for the nature of T Cha. Spatially resolved images are needed to distinguish between the two scenarios.
    Department
    Astronomy
    Subject
    circumstellar matter
    planet-disk interactions
    protoplanetary disks
    stars: individual (t cha)
    submillimeter: planetary systems
    protoplanetary disks
    radiative-transfer
    stars
    gaps
    chamaeleontis
    evolution
    system
    grains
    young
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43125
    Citation
    Cieza, Lucas A., Johan Olofsson, Paul M. Harvey, Christophe Pinte, Bruno Merín, Jean-Charles Augereau, Neal J. Evans II, Joan Najita, Thomas Henning, and Francois Ménard. "Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties." The Astrophysical Journal Letters, Vol. 741, No. 2 (Nov., 2011): L25.
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