منابع مشابه
NICMOS images of the GG Tau Circumbinary Disk
We present deep, near-infrared images of the circumbinary disk surrounding the pre–main-sequence binary star, GG Tau A, obtained with NICMOS aboard the Hubble Space Telescope. The spatially resolved proto-planetary disk scatters ∼1.5% of the stellar flux, with a near-to-far side flux ratio of ∼1.4, independent of wavelength, and colors that are comparable to the central source all of these prop...
متن کاملGas and grain chemistry in a protoplanetary disk
The chemistry in a protoplanetary accretion disk is modelled between a radius of 100 and 0.1 AU of the central object. We find that interaction of the gas with the dust grains is very important, both by removing a large fraction of the material from the gas in the outer regions and through the chemical reactions which can occur on the dust grain surfaces. In addition, collision with grains neut...
متن کاملSpectro-astrometric Imaging of Molecular Gas within Protoplanetary Disk Gaps
We present velocity-resolved spectro-astrometric imaging of the 4.7μm rovibrational lines of CO gas in protoplanetary disks using the CRIRES high resolution infrared spectrometer on the Very Large Telescope (VLT). The method as applied to three disks with known dust gaps or inner holes out to 4-45AU (SR 21, HD 135344B and TW Hya) achieves an unprecedented spatial resolution of 0.1 − 0.5AU. Whil...
متن کاملCo Gas inside the Protoplanetary Disk Cavity in Hd 142527: Disk Structure from Alma
Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD 142527 hosts a massive protoplanetary disk with a large cavity that extends up to 140 au from the central star, as seen in continuum images at infrared and millimeter wavelengths. Estimates of the survival of gas inside disk cavities are needed to discriminate between clear...
متن کاملProtoplanetary Disk Structures in Ophiuchus
We present the results of a high angular resolution (0. 3 ≈ 40AU) Submillimeter Array survey of the 345GHz (870μm) thermal continuum emission from 9 of the brightest, and therefore most massive, circumstellar disks in the ∼1Myr-old Ophiuchus starforming region. Using two-dimensional radiative transfer calculations, we simultaneously fit the observed continuum visibilities and broadband spectral...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1994
ISSN: 0252-9211
DOI: 10.1017/s0252921100019795