Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-09-04
Astronomy and Astrophysics
Astrophysics
ApJ Accepted
Scientific paper
10.1086/324285
We present spectral energy distribution (SED) models for the edge-on classical T Tauri star HH30 IRS that indicate dust grains have grown to larger than 50 microns within its circumstellar disk. The disk geometry and inclination are known from previous modeling of multiwavelength Hubble Space Telescope images and we use the SED to constrain the dust size distribution. Model spectra are shown for different circumstellar dust models: a standard ISM mixture and larger grain models. As compared to ISM grains, the larger dust grain models have a shallower wavelength dependent opacity. Models with the larger dust grains provide a good match to the currently available data, but mid and far-IR observations are required to more tightly constrain the dust size distribution. The accretion luminosity in our models is L_acc<0.2 L_star corresponding to an accretion rate of 4E-9M_sun/yr. Dust size distributions that are simple power-law extensions (i.e., no exponential cutoff) yield acceptable fits to the optical/near-IR but too much emission at mm wavelengths and require larger disk masses. Such a simple size distribution would not be expected in an environment such as the disk of HH30 IRS, particularly over such a large range in grain sizes. However, its ability to adequately characterize the grain populations may be determined from more complete observational sampling of the SED in the mid to far-IR.
Bjorkman Jon E.
Whitney Barbara
Wolff Michael J.
Wood Kenneth
No associations
LandOfFree
The Spectral Energy Distribution of HH30 IRS: Constraining The Circumstellar Dust Size Distribution does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Spectral Energy Distribution of HH30 IRS: Constraining The Circumstellar Dust Size Distribution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Spectral Energy Distribution of HH30 IRS: Constraining The Circumstellar Dust Size Distribution will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-269933