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    Herschel/PACS View Of Disks Around Low-Mass Stars And Brown Dwarfs In The TW Hydrae Association

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    Date
    2015-01
    Author
    Liu, Yao
    Herczeg, Gregory J.
    Gong, Munan A.
    Allers, Katelyn N.
    Brown, Joanna M.
    Kraus, Adam L.
    Liu, Michael C.
    Shkolnik, Evgenya L.
    van Dishoeck, Ewine F.
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    Abstract
    We conducted Herschel/PACS observations of five very low-mass stars or brown dwarfs located in the TW Hya association with the goal of characterizing the properties of disks in the low stellar mass regime. We detected all five targets at 70 mu m and 100 mu m and three targets at 160 mu m. Our observations, combined with previous photometry from 2MASS, WISE, and SCUBA-2, enabled us to construct spectral energy distributions (SEDs) with extended wavelength coverage. Using sophisticated radiative transfer models, we analyzed the observed SEDs of the five detected objects with a hybrid fitting strategy that combines the model grids and the simulated annealing algorithm and evaluated the constraints on the disk properties via the Bayesian inference method. The modeling suggests that disks around low-mass stars and brown dwarfs are generally flatter than their higher mass counterparts, but the range of disk mass extends to well below the value found in T Tauri stars, and the disk scale heights are comparable in both groups. The inferred disk properties (i.e., disk mass, flaring, and scale height) in the low stellar mass regime are consistent with previous findings from large samples of brown dwarfs and very low-mass stars. We discuss the dependence of disk properties on their host stellar parameters and find a significant correlation between the Herschel far-IR fluxes and the stellar effective temperatures, probably indicating that the scaling between the stellar and disk masses (i.e., M-disk proportional to M-star) observed mainly in low-mass stars may extend down to the brown dwarf regime.
    Department
    Astronomy
    Subject
    stars: low-mass
    circumstellar matter
    brown dwarfs
    protoplanetary
    disks
    spectral energy-distributions
    interstellar silicate mineralogy
    circumstellar dust disks
    young substellar objects
    gould belt survey
    protoplanetary disks
    radiative-transfer
    rho-ophiuchi
    evolutionary
    models
    stellar objects
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34295
    xmlui.dri2xhtml.METS-1.0.item-citation
    Liu, Yao, Gregory J. Herczeg, Munan Gong, Katelyn N. Allers, Joanna M. Brown, Adam L. Kraus, Michael C. Liu, Evgenya L. Shkolnik, and Ewine F. Van Dishoeck. >Herschel/PACS view of disks around low-mass stars and brown dwarfs in the TW Hydrae association.> Astronomy & Astrophysics, Vol. 573 (Jan., 2015): A63.
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