منابع مشابه
Large dust particles in disks around T Tauri stars
We present 7-mm continuum observations of 14 low-mass pre-main-sequence stars in the Taurus-Auriga star-forming region obtained with the Very Large Array with ∼1. ′′5 resolution and ∼0.3 mJy rms sensitivity. For 10 objects, the circumstellar emission has been spatially resolved. The large outer disk radii derived suggest that the emission at this wavelength is mostly optically thin. The millime...
متن کاملResidual Gas and Dust around Transition Objects and Weak T Tauri Stars
Residual gas in disks around young stars can spin down stars, circularize the orbits of terrestrial planets, and whisk away the dusty debris that is expected to serve as a signpost of terrestrial planet formation. We have carried out a sensitive search for residual gas and dust in the terrestrial planet region surrounding young stars ranging in age from a few to ∼10Myr. Using high-resolution 4....
متن کاملC2D Spitzer-IRS spectra of disks around T Tauri stars
1 Laboratoire d’Astrophysique de Grenoble, Université Joseph Fourier, CNRS, UMR 5571, Grenoble, France e-mail: [email protected] 2 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands 3 Max Planck Institut für Extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany 4 Herschel Science Centre, SRE-SDH, ESA PO Box 78, 28691 Villanueva de l...
متن کاملC2D Spitzer-IRS spectra of disks around T Tauri stars*
Context. Dust particles evolve in size and lattice structure in protoplanetary disks, due to coagulation, fragmentation and crystallization, and are radially and vertically mixed in disks due to turbulent diffusion and wind/radiation pressure forces. Aims. This paper aims at determining the mineralogical composition and size distribution of the dust grains in planet forming regions of disks aro...
متن کاملMass Accretion onto T Tauri Stars
It is now accepted that accretion onto classical T Tauri stars is controlled by the stellar magnetosphere, yet to date most accretion models have assumed that their magnetic fields are dipolar. By considering a simple steady state accretion model with both dipolar and complex magnetic fields we find a correlation between mass accretion rate and stellar mass of the form Ṁ ∝ Mα ∗ , with our resul...
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ژورنال
عنوان ژورنال: Journal of Astronomy and Space Sciences
سال: 2011
ISSN: 2093-5587
DOI: 10.5140/jass.2011.28.4.253