VLA imaging of the disk surrounding the nearby young star TW Hydrae

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Title: VLA imaging of the disk surrounding the nearby young star TW Hydrae
Author: Wilner, David; Ho, Paul; Kastner, Joel; Rodriguez, Luis
Abstract: The TW Hya system is perhaps the closest analog to the early solar nebula. We have used the Very Large Array to image TW Hya at wavelengths of 7 mm and 3.6 cm with resolutions 0.′′1 (~5 AU) and 1.′′0 (~50 AU), respectively. The 7 mm emission is extended and appears dominated by a dusty disk of radius >50 AU surrounding the star. The 3.6 cm emission is unresolved and likely arises from an ionized wind or gyrosynchrotron activity. The dust spectrum and spatially resolved 7 mm images of the TW Hya disk are fitted by a simple model with temperature and surface density described by radial power laws, T(r)(alpha)r^−0.5 and Sigma(r)(alpha) r^−1. These properties are consistent with an irradiated gaseous accretion disk of mass ~0.03 M⊙ with an accretion rate ~10−^8 M⊙ yr^−1 and viscosity parameter alpha= 0.01. The estimates of mass and mass accretion rates are uncertain as the gas-to-dust ratio in the TW Hya disk may have evolved from the standard interstellar value (Refer to PDF file for exact formulas).
Description: Also archived in: arXiv: astro-ph/0005019 v1 1 May 2000
Record URI: http://hdl.handle.net/1850/1865
Date: 2000-05-01

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