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20 April 2024 |
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Herbig Stars' Near-Infrared Excess: An Origin in the Protostellar Disk's Magnetically-Supported Atmosphere | | N. J. Turner
; M. Benisty
; C. P. Dullemond
; S. Hirose
; | | Date: |
3 Sep 2013 | | Abstract: | Young stars with masses 2-8 Suns, called the Herbig Ae and Be stars, often
show a near-infrared excess too large to explain with a
hydrostatically-supported circumstellar disk of gas and dust. At the same time
the accretion flow carrying the circumstellar gas to the star is thought to be
driven by magneto-rotational turbulence, which according to numerical MHD
modeling yields an extended low-density atmosphere supported by the magnetic
fields. We demonstrate that the base of the atmosphere can be optically-thick
to the starlight and that the parts lying near 1 AU are tall enough to double
the fraction of the stellar luminosity reprocessed into the near-infrared. We
generate synthetic spectral energy distributions (SEDs) using Monte Carlo
radiative transfer calculations with opacities for sub-micron silicate and
carbonaceous grains. The synthetic SEDs closely follow the median Herbig SED
constructed recently by Mulders and Dominik, and in particular match the large
near-infrared flux, provided the grains have a mass fraction close to
interstellar near the disk’s inner rim. | | Source: | arXiv, 1309.0762 | | Services: | Forum | Review | PDF | Favorites | |
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