منابع مشابه
C2D 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 کاملLarge 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 کاملA search for extended disks around weak-lined T Tauri stars
We present the results of a search for dust and gas emission around T Tauri stars in the Taurus-Auriga region, conducted with the IRAM interferometer in CO, HCO+ and the adjacent continua at 1.3 and 3.4 mm. We studied a sample of young stars with and without the near-infrared spectral signature of disks, to learn whether young stars with little or no evidence of inner accretion disks are surrou...
متن کاملOrganic molecules in protoplanetary disks around T Tauri and Herbig Ae stars
The results of single-dish observations of lowand high-J transitions of selected molecules from protoplanetary disks around two T Tauri stars (LkCa 15 and TW Hya) and two Herbig Ae stars (HD 163296 and MWC 480) are reported. Simple molecules such as CO, CO, HCO, CN and HCN are detected. Several lines of H2CO are found toward the T Tauri star LkCa 15 but not in other objects. No CH3OH has been d...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1994
ISSN: 0252-9211
DOI: 10.1017/s0252921100019485